| Item | Description |
|---|---|
| 1 | Cabin heater coolant pump |
| 2 | Cabin coolant heater |
| 3 | Cabin heater coolant diverter valve |
| 4 | Heater core |
| 5 | Cabin heater coolant temperature sensor (also known as ECT sensor 2) |
Overview
The cabin coolant heater system provides warm coolant to the heater core to warm the passenger compartment whenever the DATC module request heat and the vehicle is in a driving mode, remoted started, or doing Cabin Drive-Conditioning.
The cabin coolant heater system consists of the following components
- Cabin heater coolant pump
- Cabin coolant heater
- Cabin heater coolant diverter valve
- Heater core
- Cabin heater coolant temperature sensor (also known as ECT sensor 2)
Scheme 42
| Item | Description |
|---|---|
| 1 | Cabin heater coolant pump |
| 2 | Cabin coolant heater |
| 3 | Cabin heater coolant temperature sensor (also known as ECT sensor 2) |
| 4 | Heater core |
| 5 | Cabin heater coolant diverter valve |
Normal Operation and Fault Conditions
This pinpoint test tests the function of the cabin coolant heater system and identifies the correct cabin coolant heater system pinpoint test.
Cabin Heater Coolant Temperature Sensor
REFER to: AUXILIARY CLIMATE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2183 | Engine Coolant Temperature Sensor 2 Circuit Range/Performance | This DTC sets when the PCM senses voltage out of range on the ECT sensor 2 circuit. |
| P2184 | Engine Coolant Temperature Sensor 2 Circuit Low | This DTC sets when the PCM senses low voltage on the ECT sensor 2 circuit, indicating a short to ground. |
| P2185 | Engine Coolant Temperature Sensor 2 Circuit High | This DTC sets when the PCM senses high voltage on the ECT sensor 2 circuit, indicating a short to voltage. |
| P2186 | Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic | This DTC sets when the PCM senses erratic voltage on the ECT sensor 2 circuit, indicating an intermittent connection or a short to ground or voltage. |
DTC FAULT TRIGGER CONDITIONS
Cabin Heater Coolant Pump
REFER to: AUXILIARY CLIMATE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2600 | Coolant Pump "A" Control Circuit/Open | This DTC sets when the PCM senses an open circuit on the cabin heater coolant pump circuits. |
| P2601 | Coolant Pump "A" Control Circuit Performance/Stuck Off | This DTC sets when the PCM senses any of the following conditions: Dry-Run leads to cabin heater coolant pump running without resistance Over Temperature Over/Under Voltage Impeller Stall Impeller Speed below minimum speed Internal Error |
| P2602 | Coolant Pump "A" Control Circuit Low | This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating a short to ground to the cabin heater coolant pump. |
| P2603 | Coolant Pump "A" Control Circuit High | This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating an open circuit to the cabin heater coolant pump. |
DTC FAULT TRIGGER CONDITIONS
Cabin Heater Coolant Diverter Valve
REFER to: AUXILIARY CLIMATE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2682 | Engine Coolant Bypass Valve "A" Control Circuit Low | This DTC sets when the PCM senses low voltage on the cabin coolant heater diverter valve circuit, indicating a short to ground. |
| P2683 | Engine Coolant Bypass Valve "A" Control Circuit High | This DTC sets when the PCM senses high voltage on the cabin coolant heater diverter valve circuit, indicating a short to voltage. |
| P26AB | Engine Coolant Bypass Valve "A" Stuck/Open | This DTC sets when the PCM senses high voltage on the cabin coolant heater diverter valve circuit. |
DTC FAULT TRIGGER CONDITIONS
Cabin Coolant Heater
REFER to: AUXILIARY CLIMATE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P01E8 | Engine Coolant Heater A Control Circuit/Open | This DTC sets when the SOBDMC senses low voltage on the PWM circuit when commanding it high, indicating a short to ground or open circuit, or an internal issue in the cabin coolant heater. |
| P01EB:00 | Engine Coolant Heater A Circuit Performance: No : Sub Type Information | This DTC sets when the SOBDMC senses high voltage on the PWM circuit when commanding it low, indicating a short to voltage or an internal issue in the cabin coolant heater. |
| P01EB:96 | Engine Coolant Heater A Circuit Performance: Component Internal Failure | This fault is due to an issue with the cabin coolant heater or its cooling loop. Check for low coolant levels, blocked valves, kinked hoses, miss-routed hoses, malfunctioning coolant pumps. If heater is working, and system is providing heat to cabin, check temperature sensors. Verify High Voltage connection to heater is connected and no issues with cable. |
DTC FAULT TRIGGER CONDITIONS