Chart A Multiple Codes Stored Hard

ECM/PCM Chart A:

Sensor Circuit:

The conditions diagnosed in ECM Chart A, are caused by a single circuit failure yet result in multiple diagnostic codes. If any of these conditions are met, follow the appropriate correction procedure before using the procedures for the individual codes.

CHART A-1

If codes E022 and E032 are both current, the cause is probably the loss of 5 volts on circuit #474.

If the voltage is 0 volts at both connector terminals, A of the TPS and C of the MAP, check for an open between ECM terminal C14 and the splice.

If the proper 5 volt signal is observed on any sensor terminals, then the diagnostic procedures for each individual code must be followed. Diagnose E022 first, then code E032.

CHART A-2

If a code E015 is stored hard along with a hard code E021, the cause is probably an open in the sensor ground circuit #976.

If the voltage is 0 at both sensors, check for an open between the ECM terminal E11 and the splice.

If 5 volts is observed at either of the two sensors, then the diagnostic procedures for each individual code must be followed. Diagnose code E015 then E021.

ECM/PCM Chart A Continued:

CHART A-3

If a code E031 is stored hard along with hard codes E038, this is probably caused by an open in the sensor ground circuit #469 for the MAP, MAT and TRANS TEMP sensors.

If the voltage is 0 at both connectors, terminals A and B, check for an open between the ECM terminal A5 and the splice.

If 5 volts is observed at the sensors, then the diagnostic procedures for each individual code must be followed. Diagnose code E031, then E038.