Circuit Description
The following DTCs are for the energy storage box (ESB) fan located in the energy storage box:
P0A82 is for the hybrid battery pack cooling fan stuck OFF.
The ESB module provides a variable voltage signal to the ESB fan through the fan speed signal circuit. The ESB fan changes speed based on the voltage from the ESB module.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0A82 Hybrid Battery Pack Cooling Fan Stuck OFF
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The energy storage control module (ESCM) determines that the ESB fan is stuck OFF.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | The DTC will become history if the ESCM no longer detects a fault. |
| • | The history DTC will clear after 100 fault-free ignition cycles. |
| • | The DTC can be cleared with a scan tool. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views DEFINITION: The energy storage box (ESB) fan is inoperative. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the ESB fan operate? | -- | Go to Blower Motor Malfunction | Go to Step 3 |
3 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 4 |
4 | Connect a test lamp between the low reference circuit of the ESB fan and battery positive voltage. Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 7 |
5 | Connect a test lamp between the battery positive voltage circuit of the ESB fan and a good ground. Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 6 |
6 | Repair the battery positive voltage circuit of the ESB fan. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | -- |
7 | Repair the ground circuit of the ESB fan. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 14 | -- |
8 |
Does the volt meter read between the correct values? | 0 volts OFF and 7 volts ON | Go to Step 10 | Go to Step 9 |
9 | Test the ESB fan control circuit of the ESB fan for an open, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 |
10 | Inspect for poor connections at the harness connector of the ESB fan. 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 |
11 | Inspect for poor connections at the harness connector of the energy storage control module (ESCM). 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 |
12 | Replace the ESCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the ESB fan. Refer to Generator Battery Vent Fan Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
