Pinpoint Test E: DTCs 5-3 and 5-4
Climate Control System
Pinpoint Test E: DTCs 5-3 and 5-4
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information Electrical Diagrams.
NOTE: DTCs 5-3 and 5-4 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.
NOTE: Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to Inspection and Verification Inspection and Verification.
Normal Operation
The HVAC module receives a ground. The HVAC module is supplied constant battery voltage and ignition voltage.
- DTC 53 (Battery Voltage Low)- The module senses when battery voltage is less than 8 volts for more than 2 seconds.
- DTC 54 (Battery Voltage High)- The module senses when battery voltage is greater than 16 volts for more than 2 seconds.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HVAC module
- Battery
- Charging system concern
PINPOINT TEST E : DTCs 5-3 AND 5-4
E1 RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes) IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).
Are any charging system DTCs present in the PCM??
Yes
REFER to Charging System for diagnosis of the battery and charging system.
No
GO to E2.
E2 CHECK BATTERY CONDITION
- Ignition OFF.
- Refer to Charging System and carry out the Battery- Condition Test Pinpoint Tests.
Does the battery pass the condition test?
Yes
If the battery passed the condition test but required a recharge, REFER to Charging System to diagnose the charging system. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs). TEST the system for normal operation.
If the battery passed the condition test and did not require a recharge, GO to E3.
No
INSTALL a new battery. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). TEST the system for normal operation.
E3 CHECK THE CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine rpm to exceed above 2,000 rpm while performing this step or the generator may self-excite and result in default charging system output voltage. If engine rpm has exceeded 2,000 rpm, shut the vehicle off and restart the engine before performing this step.
- Start the engine.
- Measure the voltage of the battery:
- For DTC 54, turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes.
- For DTC 53, turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes.
Is the battery voltage between 13 and 15.2 volts?
Yes
If diagnosing DTC 5-3, GO to E4.
If diagnosing DTC 5-4, INSTALL a new HVAC module. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes).
TEST the system for normal operation.
E4 CHECK THE HVAC MODULE VOLTAGE SUPPLY CIRCUITS
- Ignition OFF.
- Disconnect: HVAC Module C228A.
- Ignition ON.
- With the engine running, measure the voltage between ground and:
- HVAC module C228A-10, circuit SBP07 (WH/RD), harness side.
- HVAC module C228A-14, circuit CBP21 (BU/GY), harness side.
Are the voltages greater than 10 volts?
Yes
GO to E5.
No
REPAIR circuit SBP07 (WH/RD) or CBP21 (BU/GY) for high resistance. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.
E5 CHECK THE HVAC MODULE GROUND CIRCUIT
- Ignition OFF.
- Measure the resistance between ground and HVAC module C228A-13, circuit GD115 (BK/GY), harness side.
Is the resistance less than 5 ohms?
Yes
GO to E6.
No
REPAIR circuit GD115 (BK/GY) for high resistance. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test. TEST the system for normal operation.
E6 CHECK THE HVAC MODULE CONNECTION
- Disconnect all the HVAC module connectors.
- Inspect the HVAC module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- 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. TEST the system for normal operation.