Circuit Description
The PCM uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When the PCM turns ON the high side driver, the voltage regulator turns ON the field circuit. When the PCM turns OFF the high side driver, the voltage regulator turns OFF the field circuit.
The PCM monitors the state of the generator turn on signal circuit. The PCM should detect a high generator turn on signal circuit voltage when the key is ON and the engine is OFF, or when the charging system malfunctions. When this occurs , the PCM will send a class 2 serial data message to the IPC to illuminate the charge indicator and set DTC B1910.
Conditions for Running the DTC
| • | No generator, CKP sensors, or CMP sensor DTCs are set. |
| • | The key is in the RUN position. |
| • | The engine is not running. |
Conditions for Setting the DTC
| • | During the key ON test, the PCM detects a high signal voltage on the generator turn on signal circuit for at least 1 seconds. |
| • | DTC B1982 is not set. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the Malfunction Indicator Lamp (MIL) |
| • | The PCM will store the conditions present when the DTC set as Fail Records data only. |
Conditions for Clearing the DTC
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the GEN F-Term Signal parameter is within the specified range? | 5-95% | Go to Step 3 | Go to Step 4 |
3 | With the scan tool command the GEN L-Term Signal Command OFF. Does the GEN F-Term Signal equal the specified value? | 0% | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 |
Is the voltage equal to the first value with the generator OFF and equal to the second value with the generator ON? | 0.0 V 5.0 V | Go to Step 5 | Go to Step 6 |
5 |
Is the GEN F-Terminal Signal display affected? | -- | Go to Step 8 | Go to Step 7 |
6 | Test the generator turn on signal circuit for a short or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
7 | Test the generator field duty cycle signal circuit for a short or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the generator. Refer to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | |
9 | Inspect for poor connections at the harness connector of the IPC. Refer to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 |
10 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
