Circuit Description
The hybrid control module (HCM) provides a ground for the PWR MAINT Relay coil circuit. This DTC detects IGN1 relay/Power maintain relay stuck on or off.
Conditions for Running the DTC
| • | Ignition state = Run Or Crank |
| • | Power maintain relay = On and APM direction = 42 to 14 |
| • | Power maintain relay = Off and Ignition state = Off |
Conditions for Setting the DTC
| • | HCM ignition state = Run Or Crank and Power Mode = Run or Crank and PCM state = Power Off or Extended Power Off. |
| • | Power Maintain relay = On and PCM state = Power Off or Extended Power Off |
| • | HCM ignition state = Accessory or Off and Power Mode = Accessory or Off and PCM state = Power Off or Extended Power Off. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool display ON? | -- | Go to Step 3 | Go to Ignition Relay Diagnosis in Engine Controls - 4.8 L, 5.3 L, and 6.0 L |
3 |
Does the scan tool display ON? | -- | Go to Step 4 | Go to Step 5 |
4 |
Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 10 |
5 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 6 |
6 | Test the control circuit of the power maintain relay from the HCM for a short to ground, open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct condition? | -- | Go to Step 14 | Go to Step 8 |
7 | Connect a test lamp between the battery positive voltage circuit of the power maintain switch circuit and a good ground. Does the test lamp illuminate? | Go to Step 9 | Go to Step 11 | |
8 | Inspect for poor connections at the harness connector of the HCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 | |
9 | Inspect for poor connections at the power maintain relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 | |
10 | Repair the open or short to ground in the power maintain relay coil circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 14 | -- | |
11 | Repair the open or short to ground in the switch circuit of the power maintain relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 14 | -- | |
12 | Replace the power maintain relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 14 | -- | |
13 | Replace the HCM. Refer to Powertrain Control Interface Module Replacement . Did you complete the replacement? | Go to Step 14 | -- | |
14 |
Does the scan tool indicate that this DTC failed this ignition? | -- | Go to Step 2 | System OK |
