Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0AC0: Hybrid Battery Current Sensor PerformanceDTC P0AC1: Hybrid Battery Current Sensor Circuit Low Voltage
DTC P0AC2: Hybrid Battery Current Sensor Circuit High Voltage
DTC P1A07: Battery Energy Control Module 5-Volt Reference Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5 Volt Reference | P1A07 | P0AC1 | P1A07 | -- |
Signal | P0AC1 | P0AC2 | P0AC2, P1A07 | -- |
Low Reference | -- | P0AC2 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: -249 to +249 amps | |||
5 V Reference | +250 amps | +235 amps | -249 amps |
Signal | +238 amps | -249 amps | -249 amps |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: Varies | |||
5 V Reference | +250 amps | +235 amps | -249 amps |
Signal | +238 amps | -249 amps | -249 amps |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: Varies | |||
5 V Reference | -63 amps | +62 amps | -54 amps |
Signal | +62 amps | -60 amps | -53 amps |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: Varies | |||
5 V Reference | -25 amps | +24 amps | -73 amps |
Signal | +25 amps | -24 amps | -23 amps |
Circuit/System Description
The hybrid battery current sensor is mounted inside the drive motor generator battery assembly. The positive high voltage cable that goes to the positive contactor relay passes through the current sensor. The current sensor detects the amperage that flows in and out of the hybrid batteries. The drive motor generator battery control module (GBCM) supplies and monitors a 5 V reference signal to the current sensor. The current sensor returns a signal between 0 and 5 V to the GBCM. The current sensor signal is in proportion to the amperage going in and out of the drive motor generator battery. A signal voltage of the current sensor greater than 2.5 V indicates that the drive motor generator battery is being discharged and a signal voltage less than 2.5 V indicates charging. The hybrid battery current sensor has 3 measurement ranges in order to maintain accuracy. The ranges are low, medium and high. The measurement ranges of the current sensor have some overlap with each other. The low range measures from -22 to +22 amps. The medium range measures from -52 to +52 amps. The high range measures from -250 to +250 amps.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The 12 V battery voltage is 9-18 V. |
Conditions for Setting the DTC
P0AC0
One of the following conditions exists:
| • | The GBCM detects greater than 5 amps on the current sensor after a successful HV system power down and after the contactors have opened. |
| • | The GBCM detects an increase in total pack voltage greater than 10 V and the current sensor measures less than a 0.5 amp increase. |
| • | The GBCM detects less than 20 amps on the high range sensor and the difference between the high range current measurement and the medium range current measurement is greater than 20 amps for 3 seconds. |
| • | The GBCM detects less than 20 amps on the high range sensor and the difference between the high range current measurement and the low range current measurement is greater than 4 amps for 3 seconds. |
P0AC1
The GBCM detects that the current sensor high range is greater than +200 amps and the current sensor medium range is greater than +52 amps and the current sensor low range is greater than +22 amps for 3 seconds.
P0AC2
The GBCM detects that the current sensor high range is less than -200 amps and the current sensor medium range is less than -52 amps and the current sensor low range is greater than -22 amps for 3 seconds.
P1A07
The GBCM detects less than 4.8 V or greater than 5.2 V on the 5 V reference circuit.
Action Taken When the DTC Sets
| • | State of charge goes to invalid. |
| • | The GBCM sends a message to the HPCM requesting that the hybrid battery power limit be set to 3 kilowatts, resulting in minimal hybrid function. |
| • | DTCs P0AC0, P0AC1, P0AC2, and P1A07 are type A DTCs. |
Conditions for Clearing the DTC
DTCs P0AC0, P0AC1, P0AC2, and P1A07 are type A DTCs.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics
Connector End View Reference
Description and Operation
Drive Motor Battery System Description
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Special Tools
EL-48900 HEV Safety Kit
Circuit/System Verification
Ignition ON, observe the scan tool Calc. Hybrid Batt. Current parameter. The reading should be between -200 and +200 amps, and change with the amount of current draw on the drive motor generator battery.
Circuit/System Testing
- Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
- Remove the drive motor generator battery case upper cover, front cover and right side cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement.
- Ignition OFF, connect the 12 V battery.
- Disconnect the harness connector at the current sensor.
- Ignition OFF, test for less than 5 Ω between low the reference circuit terminal 2 and ground.
- Ignition ON, test for 4.9-5.1 V between the 5 V reference terminal 1 and ground.
- Ignition ON, test for 4.7-5.3 V between the signal circuit terminal 3 and ground.
- If all circuits test normal, replace the current sensor.
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:| • | Identify how to disable high voltage. |
| • | Identify how to test for the presence of high voltage. |
| • | Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. |
| ⇒ | If greater than the specified range, test the low reference circuit for a open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module. |
| ⇒ | If not within the specified range, test the 5 V reference circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module. |
| ⇒ | If not within the specified range, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References - for drive motor generator battery control module replacement, setup and programming. |
