Pinpoint Test O : Insufficient Heat In Auto Start-Stop Mode Only: Notes
WARNING: This page is about a different car, the 2016 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Auto-Start-Stop System for schematic and connector information.
Normal Operation and Fault Conditions
Cabin Heater Coolant Pump - vehicles equipped with Auto Start-Stop, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2600 | Coolant Pump "A" Control Circuit/Open | This DTC sets when the PCM senses an open circuit to the cabin heater coolant pump. |
| 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. |
Possible Causes
- Wiring, terminals or connectors
- Low coolant or air in the coolant system
- Cabin heater coolant pump
- PCM