Examination
1. Check up reliability of connection to the gauge of an electric socket. Evaluate the reliability of the landing of the terminals and the condition of the wiring. If necessary, make the appropriate reconditioning of the chain.
2. Identify sensor wiring (see accompanying illustration).
Note. The color of the wire insulation may vary depending on the model of the car (see below).
3. For Civic models, the following MAP sensor wiring colors are typical:
- a) Yellow-red: nutrition;
- b) Green-white: ground;
- c) Red-Green: Signal to ECM/PCM.
4. On 1994 and 1995 Integra models. issue the following sensor wiring coding is used:
- a) Yellow-red: food (engines V18V1);
- b) Yellow-white: food (V18S1 engines);
- c) White-yellow: ground:
- d) Green/White: Signal to ECM/PCM.
5. MAP sensor wiring insulation painting for Integra models since 1996:
- a) Yellow-red: nutrition;
- b) Red-green: signal;
- c) Green-white: ground.
6. Disconnect the electrical connector of the sensor without starting the engine, turn on the ignition and measure the voltage between the terminals of the power and ground wires of the electrical wiring connector. The measurement result should be about 5 V, otherwise check the condition of the wiring, perform the necessary remedial repairs.
7. Remove the mounting screws and remove the sensor from the throttle body (see illustration above), without disconnecting the wiring from it.
8. Connect a voltmeter between the signal wire and ground wire terminals (use a straightened paper clip). With the ignition on (do not start the engine) create a vacuum at the base of the sensor removed from the throttle body. With an increase in the depth of rarefaction, the signal voltage should decrease (see accompanying table), otherwise, replace the sensor.
Depth of rarefaction, mm Hg Art. | Signal voltage value, V |
0 | 3.0 |
127 | 2.5 |
254 | 2.0 |
381 | 1.5 |
508 | 1.0 |
635 | 0.5 |
Replacement
1. Disconnect wiring from MAP sensor (see illustration above).
2. Turn out fixing screws and remove the gauge from the throttle case.
3. Installation is carried out in the reverse order.