Pinpoint Test D: DTCs P1824 and P1825
Four Wheel Drive (4WD) Systems
Pinpoint Tests
Pinpoint Test D: DTCs P1824 and P1825
Refer to Wiring Diagram Set 34, All Wheel Drive (AWD) for schematic and connector information. Diagrams By Number
Normal Operation
The All-Wheel Drive (AWD) system uses data from other systems as inputs to the 4X4 control module. The 4X4 control module uses the inputs to determine the appropriate duty cycle to send to the Active Torque Coupling (ATC) solenoid (part of rear axle) that delivers the desired torque to the rear wheels. If the 4X4 control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4X4 control module may not allow Four-Wheel Drive (4WD) operation.
- DTC P1824 (4-Wheel Drive Clutch Relay Circuit Failure) - When the 4X4 control module detects a short to ground or voltage on the ATC solenoid feedback or command circuit, this DTC is set.
- DTC P1825 (4-Wheel Drive Clutch Relay Open Circuit) - When the 4X4 control module detects an open or short to voltage on the ATC solenoid command or feedback circuit for more than 2 seconds, or the 4x4 control module detects an internal relay circuit fault, this DTC is set.
This pinpoint test is intended to diagnose the following:
- Tire/axle out of range
- ATC solenoid (part of rear axle)
- 4X4 control module
- Power Transfer Unit (PTU)
- Wiring, terminals or connectors
PINPOINT TEST D: DTCs P1824 AND P1825
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Refer to Inspection and Verification. Inspection and Verification
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D1 CHECK FOR 4X4 CONTROL MODULE DTCs
- Ignition ON.
- Carry out the 4X4 control module self-test.
- Are any DTCs received?
Yes
For DTC P1824 or P1825, GO to D2.
For all other DTCs, REFER to the 4X4 Control Module DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to D2.
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D2 CHECK THE ATC SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND WITH ATC SOLENOID (PART OF REAR AXLE) CONNECTED
- Ignition OFF.
- Disconnect: 4X4 Control Module C460.
- Measure the resistance between 4X4 control module C460-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C460-16, circuit RCF21 (WH/VT), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to D6.
No
GO to D3.
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D3 CHECK THE ATC SOLENOID CONTROL CIRCUITS FOR A SHORT TO POWER
- Measure the voltage between 4X4 control module C460-8, circuit CCF21 (VT/WH), harness side and ground: and between 4X4 control module C460-16, circuit RCF21 (WH/VT), harness side and ground
- Is any voltage present?
Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.
No
GO to D4.
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D4 CHECK THE ATC SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND WITH C460 DISCONNECTED
- Disconnect: ATC Solenoid Jumper Harness C3051.
- Measure the resistance between 4X4 control module C460-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C460-16, circuit RCF21 (WH/VT), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to D5.
No
REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
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D5 CHECK THE ATC SOLENOID JUMPER HARNESS
NOTICE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.
- Disconnect: ATC Solenoid C426.
- Inspect the ATC solenoid jumper harness for damage.
- Is the ATC solenoid jumper harness damaged?
Yes
REPAIR or INSTALL a new ATC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new rear axle assembly. REFER to Differential Assembly &/or Axle Shaft Assembly. CLEAR the DTCs. REPEAT the self-test.
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D6 CHECK ATC SOLENOID CONTROL CIRCUITS FOR AN OPEN WITH ATC SOLENOID CONNECTED
- Connect: ATC Solenoid C426 and ATC Solenoid Jumper Harness C3051.
- Measure the resistance between 4X4 control module C460-8, circuit CCF21 (VT/WH), harness side and 4X4 control module C460-16, circuit RCF21 (WH/VT), harness side.
- Is the resistance less than 10 ohms?
Yes
GO to D9.
No
GO to D7.
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D7 CHECK ATC SOLENOID CONTROL CIRCUITS FOR AN OPEN AT C3051
- Disconnect: ATC Solenoid Jumper Harness C3051.
- Measure the resistance between 4X4 control module C460-8, circuit CCF21 (VT/WH), harness side and ATC solenoid jumper harness C460-1, circuit CCF21 (VT/WH).
- Repeat this measurement while wiggling the harness.
- Measure the resistance between 4X4 control module C460-16, circuit RCF21 (WH/VT), harness side and ATC solenoid jumper harness C3051-2, circuit RCF21 (WH/VT), harness side.
- Repeat this measurement while wiggling the harness.
- Are the resistances less than 5 ohms?
Yes
GO to D8.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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D8 CHECK THE ATC SOLENOID CIRCUIT FOR AN INTERNAL OPEN
NOTICE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.
- Disconnect: ATC Solenoid C426.
- Measure the resistance between ATC solenoid C426-1, circuit CCF21 (VT/WH), component side, and ATC solenoid C426-2, circuit RCF21 (WH/VT), component side.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 10 ohms?
Yes
REPAIR or INSTALL a new ATC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new rear axle assembly. REFER to Differential Assembly &/or Axle Shaft Assembly. CLEAR the DTCs. REPEAT the self-test.
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D9 CHECK 4X4 CONTROL MODULE GROUND FOR AN OPEN
- Measure the resistance between 4X4 control module C460-15, circuit GD145 (BK/BU), harness side and ground.
- Repeat this measurement while wiggling the harness.
- Is the resistance less than 5 ohms?
Yes
GO to D10.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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D10 CHECK FOR VOLTAGE AT THE 4X4 CONTROL MODULE
- Ignition ON.
- Measure the voltage between 4X4 control module C460-5, circuit SBP11 (WH/RD), harness side and ground; and between 4X4 control module C460-4, circuit CBP35 (BN/WH), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to D11.
No
CHECK Smart Junction Box (SJB) fuses 11 (10A) and 35 (10A). REPAIR the circuit in question for open or short to ground. CLEAR the DTCs. REPEAT the self-test.
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D11 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION
- Disconnect: 4X4 Control Module C460.
- Check the harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.
- Check the ATC solenoid jumper harness between the 4X4 control module and the ATC solenoid, located on the rear subframe.
- Connect the 4X4 control module and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new 4X4 control module. REFER to 4X4 Control Module Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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.
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