ignition control circuit
#2
CIRCUIT DESCRIPTION
The ignition control module (ICM) has independent power and ground circuits. The circuits between the ICM and the powertrain control module (PCM) consists of the following circuits:
The engine is running.
CONDITIONS FOR SETTING THE DTC
The PCM does not monitor IC pulses while the IC mode spark advance is commanded
Basically the PCM does not see signals from the ICM. Check all wiring & connectors between ICM & PCM. Check for good battery & ground at the ICM. Have ICM tested.
You will need a wiring schematic and a VOM.
The ignition control module (ICM) has independent power and ground circuits. The circuits between the ICM and the powertrain control module (PCM) consists of the following circuits:
- The ignition control (IC) timing signal
- The IC timing control
- The low resolution engine speed signal
- The medium resolution engine signal
- The camshaft position signal
- The low reference
- The PCM receives the second 3X signal
- The PCM applies 5 volts to the ignition control (IC) timing signal circuit.
The engine is running.
CONDITIONS FOR SETTING THE DTC
The PCM does not monitor IC pulses while the IC mode spark advance is commanded
Basically the PCM does not see signals from the ICM. Check all wiring & connectors between ICM & PCM. Check for good battery & ground at the ICM. Have ICM tested.
You will need a wiring schematic and a VOM.
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stox58
70-81 General
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02-29-2016 09:16 PM