Diagnostic system (Honda Civic 7)

Reading diagnostic codes using a special tool

1. Turn the ignition switch to the "OFF" position.

2. Connect the special tool to the diagnostic connector.



3. Install a jumper between terminals "4" and "9" of the special device.

4. Turn on the ignition. The indicator will start flashing, displaying fault codes (see the figure "Fault codes").

5. Read and write down the fault codes. Using the "Fault Codes" table, determine and eliminate the cause of the fault.

Note:

• Error codes with numbers up to 10 are displayed by a series of short flashes. The number of flashes corresponds to the code number.
• Error codes with numbers 10 and higher are displayed in two series of flashes. The first digit of the code is determined by the initial series of long flashes, then, after a pause, a second series of short flashes follows, which corresponds to the second digit of the code.
• If there are two or more fault codes, the lowest code will be displayed first, followed by the remaining codes in ascending order.

6. After troubleshooting, clear the fault codes (see the subsection "Resetting fault codes").

7. Turn off the ignition, remove the jumper and disconnect the special tool from the diagnostic connector.

Reading diagnostic codes using a scanner

1. Turn the ignition switch to the "OFF" position.

2. Connect the scanner to the diagnostic connector.



3. Turn on the ignition. Read the fault codes.

Resetting fault codes

Using a scanner

1. Turn the ignition switch to the "OFF" position.

2. Connect the scanner.

3. Turn the ignition switch to the "ON" position.

4. Clear fault codes.

Without using a scanner

1. Turn the ignition switch to the "OFF" position.

2. Remove fuse #6 (ECU/PCM) (15A) from the relay/fuse box for more than 10 seconds.

Control unit training procedure

Perform the control unit learning procedure after performing the following operations:

• Disconnecting the wire from the negative terminal of the battery;
• Replacing the control unit or disconnecting the connector;
• Resetting control unit data;

Note: After deleting diagnostic codes using a scanner, this procedure does not need to be performed.

• Removal fuse #6 (ECU) (15A) from the relay/fuse box;
• Removal fuse #19 (80A) from the relay/fuse box;
• Removal Main Relay #1;
• Disconnecting the wiring harness from the relay/fuse box;
• Disconnecting any control system components from the wiring harness;
• Disconnecting ground wires from the automatic transmission, engine, and body.

1. Turn off all consumers (air conditioning, radio, rear door glass heater, etc.)

2. Start the engine and set the crankshaft speed to 3000 rpm. Wait until the cooling system fan turns on or the coolant temperature reaches 90°C.

3. Let the engine run for 5 minutes with the throttle fully closed.

Note: When turning on the cooling fan, stop the stopwatch and turn it on again after the fan turns off.

Table. Diagnostic trouble codes (d series engines).

Honda tester code	SAE code	System or sensor
0-2	R1607	Control unit
0-29	R1607	Control unit
1-1	P0131	Low signal from the oxygen sensor before the catalytic converter
1-2	P0132	High signal oxygen sensor before catalytic converter
3-1	P0107	Low signal from the intake manifold vacuum sensor
3-2	P0108	Intake Manifold Vacuum Sensor High Signal
4-1	P0335	No signal from crankshaft position sensor
4-2	P0336	Incorrect crankshaft position sensor signal
4-6	P0339	Poor contact of the crankshaft position sensor electrical circuit
6-1	P0117	Coolant Temperature Sensor Low Signal
6-2	P0118	Coolant Temperature Sensor High Signal
7-1	P0122	Throttle Position Sensor Low Signal
7-2	P0123	Throttle Position Sensor High Signal
8-1	R1362	Low signal from the camshaft position sensor
8-5	P0340	Camshaft Position Sensor Electrical Circuit Malfunction
8-2	R1361	High signal from the camshaft position sensor
8-7	P0344	Poor contact of the electrical circuit of the camshaft position sensor
10-1	P0112	Low Intake Air Temperature Sensor Signal
10-2	P0113	Intake Air Temperature Sensor High Signal
12-2	R1498	EGR Valve High Signal
12-5	P0406	EGR Valve High Signal
12-3	R1491	EGR valve wiring harness break
12-4	P0404	EGR valve wiring harness break
13-1	R1107	Low signal from the intake manifold vacuum sensor
13-5	R2228	Low signal from the intake manifold vacuum sensor
13-2	R1108	Intake Manifold Vacuum Sensor High Signal
13-6	R2229	Intake Manifold Vacuum Sensor High Signal
14-3	R1519	Valve of the idle speed control system
14-12	P0511	Valve of the idle speed control system
17-1	P0500	No vehicle speed sensor signal
17-2	P0501	No vehicle speed sensor signal
20-1	R1297	Low signal from the power supply voltage monitoring system unit
20-2	R1298	High signal from the power supply voltage monitoring system unit
21-1	R1253	Variable Valve Timing and Elevation Control (VTEC)
21-4	R2645	Variable Valve Timing and Elevation Control (VTEC)
23-1	P0325	Knock sensor wiring harness break
23-2	R1324	Incorrect knock sensor signal
34-2	P0563	Control unit supply voltage
39-1	P0600	Multiplex data bus
41-1	R1166	Air-fuel ratio sensor heater wiring harness break
41-2	P0135	Open in the wiring harness of the oxygen sensor heater before the catalytic converter
41-2	P0135	Air-fuel ratio sensor heater wiring harness break
41-2	P0135	Open in the wiring harness of the oxygen sensor heater before the catalytic converter
41-4	R1167	Air-fuel ratio sensor heater wiring harness break
41-5	P0135	Air-fuel ratio sensor heater wiring harness break
41-7	P0134	Air-fuel ratio sensor heater wiring harness break
45-1	P0172	Clogged intake system, electropneumatic valve of the fuel vapor capture system, fuel pressure, exhaust gas recirculation system (EGR), nozzle, heated oxygen sensor
45-2	P0171	Intake/Exhaust Leak, Secondary Air Injection System, Mass Air Flow Sensor, Fuel Pressure/Fuel Pump, Injector, Heated Oxygen Sensor
48-3	R1162	Oxygen sensor
48-5	R1157	Mixture Composition Sensor (LAF)
48-17	R2252	Low Air-Fuel Ratio (LAF) Sensor Signal (-)
48-18	R2238	Low Air-Fuel Ratio (LAF) Sensor Signal (+)
63-1	P0137	Heated Oxygen Sensor After Catalytic Converter Low Signal
63-2	P0138	Heated Oxygen Sensor After Catalytic Converter High Signal
63-3	P0139	Damage to the oxygen sensor after the catalytic converter
65-2	P0141	Oxygen sensor heater wiring harness broken after catalytic converter
70-2	-	Automatic transmission
71-3	-	Automatic transmission
71-1	P0301	Cylinder 1 - misfire
72-1	P0302	Cylinder 2 - misfire
73-1	P0303	Cylinder 3 - misfire
74-1	P0304	Cylinder 4 - misfire

Table. Diagnostic trouble codes (engine K20A).

Indicator flashing	SAE code	System or sensor
56	P0010	Variable Valve Timing (VTC) Valve
56	P0011	Variable Valve Timing (VTC)
3	P0107	Low signal from the intake manifold vacuum sensor
3	P0108	Intake Manifold Vacuum Sensor High Signal
10	P0112	Intake Air Temperature Sensor Low Signal
10	P0113	Intake Air Temperature Sensor High Signal
86	P0116	Coolant temperature sensor
6	P0117	Low Coolant Temperature Sensor Signal
6	P0118	Coolant Temperature Sensor High Signal
7	P0122	Throttle Position Sensor Low Signal
7	P0123	Throttle Position Sensor High Signal
87	P0128	Cooling system
41	P0134	Air-Fuel Composition Sensor - No Response
63	P0137	Heated Oxygen Sensor After Catalytic Converter Low Signal
63	P0138	Heated Oxygen Sensor After Catalytic Converter High Signal
63	P0139	Damage to the oxygen sensor after the catalytic converter
65	P0141	Oxygen sensor heater wiring harness broken after catalytic converter
45	P0171	Poor fuel mixture Leaky intake / exhaust system, exhaust air supply system, mass flow sensor, fuel pressure / fuel pump. nozzle, heated oxygen sensor
45	P0172	Rich fuel mix Clogging of the intake system, electropneumatic valve of the fuel vapor capture system, fuel pressure, exhaust gas recirculation system (EGR), nozzle. heated oxygen sensor
71	P0301	Cylinder 1 - misfire
72	P0302	Cylinder 2 - misfire
73	P0303 -	Cylinder 3 - misfire
74	P0304	Cylinder 4 - misfire
71,72, 73, 74	P0300	Multiple misfires
23	P0325	Knock sensor wiring harness break
4	P0335	No signal from crankshaft position sensor
4	P0336	Incorrect crankshaft position sensor signal
57	P0340	Camshaft Position Sensor Electrical Circuit Malfunction
57	P0341	Camshaft Position Sensor
57	P0344	Poor contact of the electrical circuit of the camshaft position sensor
67	P0420	Low efficiency of the catalytic converter
97	P0451	Fuel Evaporative Emission System Pressure Sensor
97	P0452	Fuel Evaporative Emission System Pressure Sensor Low Signal
97	P0453	Fuel Evaporative Emission System Pressure Sensor High Signal
17	P0500	No vehicle speed sensor signal
14	P0505	Idle Speed Control System - Malfunction
34	P0563	Control unit supply voltage
39	. P0600	Multiplex system circuit failure
13	R1106	Absolute pressure sensor
13	R1107	Low Absolute Pressure Sensor Signal
13	R1108	Absolute pressure sensor high signal
7	R1121	Throttle position sensor signal is below the calculated value
7	R1122	Throttle position sensor signal is higher than expected
5	R1128	Absolute pressure sensor signal is lower than calculated
5	R1129	Absolute pressure sensor signal is higher than calculated
48	R1157	Mixture Composition Sensor (LAF)
48	R1158	Low signal air-fuel ratio sensor (LAF)
48	R1159	High Air-Fuel Ratio (LAF) Sensor Signal
41	R1166	Mixture Composition Sensor (LAF)
41	R1167	Mixture Composition Sensor (LAF)
22	R1259	Variable Valve Timing and Elevation Control (VTEC)
20	R1297	Low signal from the power supply voltage monitoring system unit
20	R1298	High signal from the power supply voltage monitoring system unit
8	R1361	High signal from the camshaft position sensor
8	R1362	Low signal from the camshaft position sensor
8	R1456	Fuel vapor recovery system leak (fuel tank)
8	R1457	Fuel vapor recovery system leak (fuel vapor accumulator)
109	R1505	Positive crankcase ventilation valve leak
14	R1519	Valve of the idle speed control system
0-29	R1607	Control unit

Electronic control unit terminals Table. Electronic control unit terminals (D17A).

Connector "A"

Conclusion	Color	Sensor or element	Verification conditions	Voltage, V
1A*7	B/W	Heated oxygen sensor before catalytic converter	Ignition switch in the "ON" position	Vv
			The engine is warm, idling	It's changing
1A*1	G	Heated fuel mixture sensor	Ignition switch in the "ON" position	Vv
			The engine is warm, idling	0
2A	Y/B	Supply voltage Relay No.2	Ignition switch in the "ON" position	Vv
			Ignition switch in the "OFF" position	0
3A	Y/B	Supply voltage Relay No.1	Ignition switch in the "ON" position	Vv
			Ignition switch in the "OFF" position	0
4A	IN	Mass No.2	Constantly	0
5A	IN	Mass No.1	Constantly	0
6A*7	W	Heated oxygen sensor before catalytic converter	Engine warm, idling → throttle fully open	＞0,6
			The throttle valve is closed quickly	＜0,4
6A*2	R	Heated fuel-air ratio sensor (+)	-	-
7A	Bl	Crankshaft position sensor	Idling	Pulses
8A*2	Y	Vehicle speed sensor supply voltage	Ignition switch in the "ON" position	≈5
			Ignition switch in the "OFF" position	0
9A*2	R/BI	Knock sensor	Ignition switch in the "ON" position	≈5
			During detonation	Pulses
10A	G/Y	Mass of sensors	Constantly	0
11A	G/W	Mass of sensors	Constantly	0
12A	B/R	Valve of the idle speed control system	Ignition switch in the "ON" position	≈5
			Idling	It's changing
13A*2	W/B	EGR valve position sensor	Idling	≈1,2
			The valve is fully open	≈3,8
14A*5	B/W	Heated oxygen sensor after catalytic converter	Ignition switch in the "ON" position	Vv
			The engine is warm, idling	It's changing
15A	R/B	Throttle Position Sensor	The throttle valve is fully open	4,14-4,82
			The throttle valve is completely closed	0,44-0,56
16A*1	R	Heated fuel-air ratio sensor (-)	-	-
18A*10	W/G	Vehicle speed sensor	When moving	Pulses
19A	G/R	Intake manifold vacuum sensor	Ignition switch in the "ON" position	≈3
			Idling	≈1,5
20A	Y/BI	Sensor supply voltage	Ignition switch in the "ON" position	≈5
			Ignition switch in the "OFF" position	0
21A	Y/R	Sensor supply voltage	Ignition switch in the "ON" position	≈5
			Ignition switch in the "OFF" position	0
22A*1	W	Heated fuel-air ratio sensor (+)	Ignition switch in the "ON" position	Vv
23A	R/Y	Mass of sensors	Constantly	0
24A	R/Y	Mass of sensors	Constantly	0
25A	W/R	Heated oxygen sensor before catalytic converter	Engine warm, idling → throttle fully open	＞0,6
			The throttle valve is closed quickly	＜0,4
26A	G	Camshaft Position Sensor	Idling	Pulses
27A	Br	Ignition coil #4	Ignition switch in the "ON" position	0
			Idling	0 ＜ - ＞ Vv Pulses
28A	W/Bl	Ignition coil #3	Ignition switch in the "ON" position	0
			Idling	0 ＜ - ＞ Vv Pulses
29A	Bl/R	Ignition coil #2	Ignition switch in the "ON" position	0
			Idling	0 ＜ - ＞ Vv Pulses
30A	Y/G	Ignition coil #1	Ignition switch in the "ON" position	0
			Idling	0 ＜ - ＞ Vv Pulses

Connector "B"

Conclusion	Color	Sensor or element	Verification conditions	Voltage, V
2B	Y	Nozzle #4	Ignition switch in the "ON" position	Vv
			Idling	It's changing
ZV	Bl	Nozzle #3	Ignition switch in the "ON" position	Vv
			Idling	It's changing
4B	R	Nozzle #2	Ignition switch in the "ON" position	Vv
			Idling	It's changing
5B	Br	Nozzle #1	Ignition switch in the "ON" position	Vv
			Idling	It's changing
6B	G	Cooling system fan and air conditioner condenser fan relay	The fans are working	0
			The fans are not working	Vv
7B*8	R/B	Pressure control solenoid valve "A" (+)	Ignition switch in the "ON" position	It's changing
7B*9	G/W	Solenoid valve for pressure distribution between pulleys (+)	Ignition switch in the "ON" position	It's changing
8B	R/W	Coolant temperature sensor	Ignition switch in the "ON" position	0
			When the engine is running	0,1-4,8
10V	W/BI	Generator, terminal "L"	Ignition switch in the "ON" position	0
			Idling	Vv
13B	W/R	Generator, pin "FR"	The engine is warm, idling	0-5
14B*2	Bl/R	EGR valve	When the valve is operating	It's changing
			The valve is not working	0
15B*1	G/Y	Variable valve timing system valve	At low crankshaft speed	0
16B*8	B/R	Solenoid valve "B" pressure control (+)	Ignition switch in the "ON" position	It's changing
16B*9	Y/G	Solenoid valve for control of starting clutch (+)	Ignition switch in the "ON" position	It's changing
17B	Kr/F	Intake Air Temperature Sensor	Ignition switch in the "ON" position	0,1-4,8
18B	W/G	Generator	The engine is warm, idling	Vv
			Light load	0
20B*15	R	Start inhibit switch (position "D3")	Automatic transmission selector in position "D3"	0
			Other	5＜-＞Vb
20B*16	R	Start inhibit switch (position "S")	Automatic transmission selector in position "S"	0
			Other	5＜-＞Vb
21B	Y/BI	Fuel vapor accumulator solenoid valve	Idle speed, coolant temperature ＜ 70°C	0
			Idle speed, coolant temperature ＞ 70°C	It's changing

Connector "C"

Conclusion	Color	Sensor or element	Verification conditions	Voltage, V
1C*8	W/B	Pressure control solenoid valve "A" (-)	Ignition switch in the "ON" position	It's changing
1C*9	B/R	Pressure control solenoid valve (-)	Ignition switch in the "ON" position	It's changing
2C*8	Y/BI	Torque Converter Lockup Solenoid Valve	Works	Vv
			It doesn't work	0
2C*9	G/Y	Solenoid valve "A"	Works	Vv
			It doesn't work	0
4C*8	G/W	Gear shift solenoid valve "A"	Automatic transmission selector in position "D", "D3" (1st or 2nd gear) or position "2"	Vv
			Automatic transmission selector in position "D", "D3" (3rd gear), position "D" (4th gear) or position "1"	0
4C*9	R/Y	Solenoid valve "B"	Works	Vv
			It doesn't work	0
6C*8	Bl/B	Gear shift solenoid valve "A"	AKAP selector in position "D", "D3" (2 or 3 gear) or position "1", "2"	Vv
			Automatic transmission selector in position "D", "D3" (1st or 2nd gear), Automatic transmission selector in position "D", "D3" (1 gear), Automatic transmission selector in position "D4" (4th gear)	0
6C*9	G/R	Start inhibit solenoid valve	Works	Vv
			It doesn't work	Pulses
7C*8	W/R	Automatic transmission input shaft speed sensor	Automatic transmission selector in position "P", "N", engine running or in motion	Pulses
7C*9	R/BI	CVT drive pulley speed sensor	In addition to the automatic transmission selector position in "P", "N"	Pulses
8C*8	Br/W	Solenoid valve "B" pressure control (-)	Ignition switch in the "ON" position	It's changing
8C*9	Bl/R	Solenoid valve for control of starting clutch (-)	Ignition switch in the "ON" position	It's changing
9C*11	R	Overdrive Switch "D3"	Automatic transmission selector in position "D3"	0
			Other	5＜-＞Vb
9C*13	R	Start inhibit switch (position "S")	Automatic transmission selector in position "S"	0
			Other	5＜-＞Vb
10C*13	W	Start inhibit switch (position "R")	Automatic transmission selector in position "R"	0
			Other	5＜-＞Vb
11C*8	BI	Start inhibit switch (position "2")	Automatic transmission selector in position "2"	0
			Other	5＜-＞Vb
11C*9	BI	Start inhibit switch (position "L")	Automatic transmission selector in position "L"	0
			Other	5＜-＞Vb
12C*13	BI/W	Start inhibit switch (position "P" or "N")	Automatic transmission selector in position "N" or "P"	0
			Other	5＜-＞Vb
13C*14	R/B	Start inhibit switch (position "N")	Automatic transmission selector in position "N"	0
			Other	5＜-＞Vb
14C*8	G	Automatic transmission output shaft speed sensor	Weight	0
15C*8	Bl	Automatic transmission output shaft speed sensor	Ignition switch in the "ON" position, front wheels are rotating	Pulses
15C*9	W/G	CVT driven pulley speed sensor	Automatic transmission selector in a position other than "N" or "P"	Pulses
16C*9	G/Y	Solenoid valve for pressure distribution between pulleys	Ignition switch in the "ON" position	Pulses
20C*13	Y	Start inhibit switch (position "D")	Automatic transmission selector in position "D"	0
			Other	5＜-＞Vb
21C*8	W/G	Automatic transmission input shaft speed sensor (ground)	Weight	0
22C*9	W/R	Speed sensor #2 (ground)	Weight	0

Connector "E"

Conclusion	Color	Sensor or element	Verification conditions		Voltage, V
2E*6	B/Kr	Oxygen sensor after catalytic converter	The engine is warm, idling	The throttle valve is fully open	＞0,6
				The throttle valve is completely closed	＜0,4
ZE	Kch/F	Weight of control unit	Weight		0
4E*6	Rz	Mass of sensors	Weight		0
6E*6	B/W	Heated oxygen sensor after catalytic converter	Ignition switch in the "ON" position		Vv
			The engine is not warmed up, idling		It's changing
7E	Kr/F	Main relay	Ignition switch in the "ON" position		0
			Ignition switch in the "OFF" position		Vv
8E*1	ABOUT	Heated mixture composition sensor	Ignition switch in the "ON" position		0
9E	W/C	Ignition switch	Ignition switch in the "ON" position		Vv
			Ignition switch in the "OFF" position		0
10E	3/F	Fuel pump relay, relay #2	Within 2 seconds when the ignition switch is set to the "ON" position		0
			Other		Vv
15E	G/R	Power supply voltage control system unit	Idle, low load		2,5-3,5
			Headlights are on		1,5-2,5
16E	Lg/B	Power Steering Fluid Pressure Sensor	The steering wheel is motionless		0
			When turning the steering wheel		Vv
18E	R	Air Conditioning Compressor Clutch Relay	Air conditioning switch in the "ON" position		0
			Air conditioner switch in the "OFF" position		Vv
22E	W/B	Brake light switch	Pedal not pressed		0
			The pedal is pressed		Vv
23E	Sb	Diagnostic connector	Ignition switch in the "ON" position		Vv
24E	Y	Electrical equipment control system MULTIPLEX	Ignition switch in the "ON" position		5
			After starting the engine with consumers on		Pulses
25E*9	Bl/W	Vehicle speed sensor	When moving		Pulses
26E	WITH	Crankshaft position sensor	Idling		Pulses
29E	Br	Diagnostic connector	Closed		0
			Not closed		5＜-＞Vb
31E	G/O	Indicator "CHECK ENGINE"	The indicator is on		0
			The indicator does not light		Vv

Note:

• *1 - Models with D15B SOHC VTEC (lean burn) engine.
• *2 - Models with D15B SOHC VTEC, D17A SOHC engine.
• *3 - 2WD models with D15B SOHC engine.
• *4 - 4WD models with D15B SOHC, D15B SOHC VTEC (lean burn), D17A SOHC engine.
• *5 - 2WD models with D15B SOHC, D15B SOHC VTEC (lean burn) engine.
• *6 - Models with D15B SOHC VTEC engine (lean burn, except 2WD), D17A SOHC VTEC.
• *7 - Except for models with D15B SOHC VTEC (lean burn) engine.
• *8 - Models with automatic transmission.
• *9 - Models with CVT.
• *10 - Models with manual transmission, automatic transmission.
• *11 - Sedan, models with automatic transmission
• *12 - Sedan, models with CVT.
• *13 - Models with automatic transmission, with CVT.
• *14 - Hatchback, models with automatic transmission or with a CVT.
• *15 - Hatchback, models with automatic transmission.
• *16 - Hatchback, models with CVT.

(Article source on the website HondaBook)