Hard Trouble Code E32: Notes

NOTE: If this code is not displayed during second pass of diagnostic codes, it is an intermittent failure and cannot be diagnosed using this procedure.

The ECM supplies 5 volt signal to pin C (circuit No. 474) of MAP sensor and supplies ground path to pin A (circuit No. 476X). The MAP signal from pin B (circuit No. 432) is a variable voltage that is dependent on manifold pressure.

Trouble code indicates that voltage signal from MAP sensor is too low. This situation can be observed in engine data display parameter "P.0.2" as reading of 14-16 kPa. Possible causes of this condition are: Defective MAP sensor, defective wiring, terminals, etc., or ECM is not able to process signals properly.

NOTE: The following step numbers refer to the numbers in the accompanying flow chart(s).

If opposite condition (high MAP signal) can be created, the self-diagnostics can be used to detect failure by displaying engine data parameter "P.0.2". With opposite condition created, parameter "P.0.2" should display reading of 106-108 kPa. To create high sensor signal, disconnect MAP sensor connector and jumper circuit Nos. 432 and 474 together. If reading is 106-108 kPa, fault must be improper mating of sensor terminals or faulty MAP sensor.
If reading is 105 kPa or less, measure voltage on circuit No. 474. If voltmeter reads 0 volts, MAP sensor is not receiving 5 volts and circuit No. 474 must be repaired for an open or short to ground.
If voltmeter reads 5 volts, then measure voltage between circuit Nos. 474 and 432. If voltage is 5 volts, check circuit No. 432 for short to ground. If wiring is okay, then fault must be in ECM connector or ECM itself.
If voltmeter does not read 5 volts, then an open must exist in either the wiring harness or ECM. If reading is still 105 kPa or less with circuit Nos. 474 and 432 jumpered together at ECM, fault must be in ECM connector or ECM itself. If reading is 106-108 kPa, then circuit No. 432 is open.