Circuit Description
The following DTCs are for the battery temperature sensors located in the energy storage box (ESB) on each battery:
| • | P0ACB is for the hybrid battery 3 temperature sensor performance. |
| • | P0AC6 is for the hybrid battery 2 temperature sensor performance. |
| • | P0A9C is for the hybrid battery 1 temperature sensor performance. |
Battery temperature sensors allow the energy storage control module (ESCM) to monitor the temperature of the batteries in the energy storage box. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the battery temperature sensors. The module provides ground to the battery temperature sensors through the low reference circuit. The ESCM monitors the voltage drops across the battery temperature sensors and uses the inputs for hybrid calculations. When the battery temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the battery temperatures are hot, the resistances of the sensors are low and the voltage signals are low.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC P0A9C Hybrid Battery 1 Temperature Sensor Performance |
| • | DTC P0AC6 Hybrid Battery 2 Temperature Sensor Performance |
| • | DTC P0ACB Hybrid Battery 3 Temperature Sensor Performance |
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The engine has been running for 30 seconds. |
Conditions for Setting the DTC
| • | P0ACB is set when the ESCM has determined that the battery 3 temperature sensor value differs by more than 15 degrees from the average of the 3 sensors. |
| • | P0AC6 is set when the ESCM has determined that the battery 2 temperature sensor value differs by more than 15 degrees from the average of the 3 sensors. |
| • | P0A9C is set when the ESCM has determined that the battery 1 temperature sensor value differs by more than 15 degrees from the average of the 3 sensors. |
Conditions for Clearing the DTC
| • | The DTC will become history if the ESCM no longer detects a fault. |
| • | The history DTC will clear after 40 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 | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Are there any DTCs present in the SGCM? | -- | Go to Step 3 | |
3 | Does the scan tool display DTCs P1A22, P1A23, P1A24, P1A26, P1A27, P1A28, P1A29, P1A2A, P1A2B, P1A2D, P1A2E, P1A2F, P1A30, P1A31, P1A32, P1A34, P1A35 or P1A36 set as current or history in the energy storage control module (ESCM)? | -- | Go to Step 4 | |
4 | With the scan tool record the temperature of all 3 temperature sensors and find the average of the 3. Are all of the battery temperature sensors within 15 degrees of the average? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 5 |
5 |
Is the recorded temperature within the specified value of the scan tool value? | 2° | Go to Step 7 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the appropriate battery temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8 |
7 | Replace the appropriate battery. Refer to Generator Battery Replacement. Did you complete the replacement? | -- | Go to Step 9 | -- |
8 | Replace the appropriate battery temperature sensor. Refer to Battery Temperature Sensor Replacement. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 4 | System OK |
