Pinpoint Test E: DTC B2426, B2427, B2795 Or B2796
Climate Control System
Pinpoint Tests
Pinpoint Test E: DTC B2426, B2427, B2795 or B2796
Refer to Wiring Diagram Set 55 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the sunload sensor receives a ground from the HVAC module. As the light applied to the sensor changes, the PCM detects the change through the RH and LH feedback circuits.
B2426-B2796:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Solar radiation sensor
- HVAC module - Dual Automatic Temperature Control (DATC)
PINPOINT TEST E: DTC B2426, B2427, B2795 OR B2796
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E1 CHECK THE SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Sunload Sensor C286.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between sunload sensor C286-4, circuit GD114 (BK/BU), harness side and sunload sensor:
- C286-1, circuit VH417 (YE/OG), harness side.
- C286-3, circuit VH416 (VT/GY), harness side.
- Is the voltage between 4.7 and 5.1 volts?
Yes
INSTALL a new sunload sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If code returns, GO to E5.
No
For DTC B2796 or B2426, GO to E2.
For DTC B2795 or B2427, GO to E4.
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E2 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and sunload sensor C286-4, circuit GD114 (BK/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E3.
No
REPAIR circuit GD114 (BK/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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E3 CHECK CIRCUITS RH111 (GY/BU) AND VH417 (YE/OG) OR VH416 (VT/GY) FOR AN OPEN
- Disconnect: HVAC Module - DATC C2356A.
- Measure the resistance between sunload sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module - DATC C2356A-10, circuit RH111 (GY/BU), harness side.
DTC B2796
- NOTE: For DTC B2796.
- Measure the resistance between HVAC module - DATC C2356A-5, circuit VH416 (VT/GY), harness side and sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
DTC B2426
- NOTE: For DTC B2426.
- Measure the resistance between HVAC module - DATC C2356A-4, circuit VH417 (YE/OG), harness side and sunload sensor C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to E5.
No
REPAIR circuit RH111 (GY/BU), VH416 (VT/GY) or VH417 (YE/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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E4 CHECK CIRCUITS VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module - DATC C2356A.
- Measure the resistance between ground and:
- For DTC B2795, sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B2427, sunload sensor C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to E5.
No
REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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E5 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVAC module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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