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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2533 Ignition relay rationality fault
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 Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool display ON? | -- | Go to Step 3 | Go to Ignition Relay Diagnosis |
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 . 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 . 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 . 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 . 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 . Did you complete the repair? | Go to Step 14 | -- | |
12 | Replace the power maintain relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 14 | -- | |
13 | Replace the HCM. Refer to Control Module References for replacement, setup and programming. 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 |
