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Pinpoint Test P: Temperature Control is Inoperative/Does Not Operate Correctly - EMTC (Electronic Manual Temperature Control)




Climate Control System

Pinpoint Test P: Temperature Control is Inoperative/Does Not Operate Correctly - EMTC (Electronic Manual Temperature Control) Systems

Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, to rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuators through the door actuator motor circuits. To reverse the temperature blend door actuator rotation, the HVAC module reverses the voltage and ground circuits.

The temperature blend door actuator feedback resistors are supplied a ground from the HVAC module by the temperature blend door actuator return circuits and a 5-volt reference voltage on the temperature blend door actuator reference circuits. The HVAC module reads the voltage on the temperature blend door actuator feedback circuits to determine the temperature blend door actuator position by the position of the actuator feedback resistor wiper arm.

During an actuator calibration cycle, the HVAC module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be from the expected outlets.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Temperature blend door actuator

- HVAC module

- Stuck or bound linkage or door

PINPOINT TEST P : TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - EMTC (Electronic Manual Temperature Control) SYSTEMS

P1 CHECK THE HVAC MODULE FOR DTCs

- Ignition ON.

- Check the HVAC module for DTCs.

Are any DTCs present?

Yes

For DTC B1081:00, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, GO to P3.

For DTC B1081:12, GO to P2.

For DTC B1081:11, GO to P4.

For DTC B11E5:15, GO to P6.

For DTC B11E5:11, GO to P10.

No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to P13.

P2 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER

- Ignition OFF.

- Disconnect: HVAC Module- Electronic Manual Temperature Control (EMTC) C2357.

- Ignition ON.

- Measure the voltage between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-18, circuit CH238 (YE/OG), harness side.

- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-19, circuit CH239 (BU/WH), harness side.






Are any voltages present?

Yes
REPAIR the circuit(s) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
GO to P5.

P3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN

NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.

- Disconnect: LH Temperature Blend Door Actuator C2091.

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357, harness side and LH temperature blend door actuator C2091, harness side using the following chart:









Are the resistances less than 5 ohms?

Yes
GO to P13.

No
REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P4 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.

- Measure the resistance between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-18, circuit CH238 (YE/OG), harness side.

- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-19, circuit CH239 (BU/WH), harness side.






Are the resistances greater than 10,000 ohms?

Yes
GO to P5.

No
REPAIR the circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P5 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER

NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

- Ignition OFF.

- Disconnect: LH Temperature Blend Door Actuator C2091.

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-19, circuit CH239 (BU/WH), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-18, circuit CH238 (YE/OG), harness side.





Is the resistance greater than 10,000 ohms?

Yes
GO to P13.

No
REPAIR circuit(s) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P6 CHECK CIRCUIT VH440 (BU/BN) FOR AN OPEN

NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.

- Disconnect: LH Temperature Blend Door Actuator C2091.

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit VH440 (BU/BN), harness side and LH temperature blend door actuator C2091-4, circuit VH440 (BU/BN), harness side.





Is the resistance less than 5 ohms?

Yes
GO to P7.

No
REPAIR circuit VH440 (BU/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P7 CHECK CIRCUIT VH440 (BU/BN) FOR A SHORT TO POWER

- Ignition ON.

- Measure the voltage between ground and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit VH440 (BU/BN), harness side.





Is any voltage present?

Yes
REPAIR circuit VH440 (BU/BN) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
GO to P8.

P8 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO CIRCUIT VH440 (BU/BN)

- Ignition OFF.

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit LH111 (BN/WH) and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit VH440 (BU/BN), harness side.





Is the resistance greater than 10,000 ohms?

Yes
GO to P9.

No
REPAIR circuits LH111 (BN/WH) and VH440 (BU/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P9 CHECK THE ACTUATOR RETURN CIRCUIT RH107 (GN/BU) FOR AN OPEN

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-4, circuit RH107 (GN/BU) and LH temperature blend door actuator C2091-2, circuit RH107 (GN/BU), harness side.





Is the resistance less than 5 ohms?

Yes
GO to P13.

No
REPAIR circuit RH107 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P10 CHECK CIRCUIT VH440 (BU/BN) FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: HVAC Module- EMTC (Electronic Manual Temperature Control) C2357.

- Measure the resistance between ground and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit VH440 (BU/BN), harness side.





Are the resistances greater than 10,000 ohms?

Yes
GO to P11.

No
REPAIR circuit VH440 (BU/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P11 CHECK CIRCUIT RH107 (GN/BU) FOR A SHORT TO CIRCUIT VH440 (BU/BN)

NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.

- Disconnect: LH Temperature Blend Door Actuator C2091.

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-4, circuit RH107 (GN/BU) and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-7, circuit VH440 (BU/BN), harness side.





Is the resistance greater than 10,000 ohms?

Yes
GO to P12.

No
REPAIR circuits RH107 (GN/BU) and VH440 (BU/BN) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P12 CHECK CIRCUIT LH111 (BN/WH) FOR AN OPEN

- Measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit LH111 (BN/WH) and LH temperature blend door actuator C2091-3, circuit LH111 (BN/WH), harness side.





Are the resistances less than 5 ohms?

Yes
GO to P13.

No
REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

P13 CHECK THE ACTUATOR CONNECTION

- Disconnect the actuator connector.

- Check for:
- corrosion.
- pushed-out terminals.
- damaged terminals.


- Connect and correctly seat the actuator connector.

- Clear the DTCs.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
CARRY OUT the Temperature Blend Door Actuator component test. If the actuator tests OK, GO to P14. Component Tests and General Diagnostics

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.

P14 MODULE ACTUATOR POSITION CALIBRATION

NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out the calibration, follow the steps below.

- Ignition OFF.

- Inspect the module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.


- Connect and correctly seat all the HVAC module connectors.

- Ignition ON.

- Clear the DTCs.

- Select any position except OFF.

- NOTE: The HVAC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.
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 now operating correctly at this time. The concern may have been caused by a foreign object in the HVAC case or temporary binding that restricted actuator door travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator linkage and door for binding and CHECK HVAC case for foreign objects.

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