Test Description
The numbers listed below refer to step numbers in the diagnostic procedure
- 1 This step determines if the scan tool is receiving power through the DLC connector.
- 2 The MIL should illuminate whenever the ignition is on and the engine is not running.
- 3 This step determines if the PCM is transmitting class 2 serial data to the DLC, and that the class 2 data circuit is not open or shorted.
- 4 This step determines if a DTC is current or stored in history.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 The normal state is the state of the input before activation.
- 4 The normal state is the state of the input before activation.
- 8 After replacement of the BCM you must calibrate the new module for proper operation.
The number listed below refers to step number in the diagnostic procedure
- 3 This step inspects for air restrictions and loss of transmission fluid flow, causing an extremely high transmission fluid temperature.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests the OSS circuit.
- 7 This step tests the integrity of the OSS sensor.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests the OSS and the circuit.
- 7 This step tests the integrity of the OSS.
The numbers listed below refer to step numbers in the diagnostic procedure
- 5 By disconnecting the TR switch, the ground path of all TR switch circuits would be removed, and the PCM would recognize all circuits as open. The scan tool will display HI for all range signals.
- 6 This step tests TR switch wiring for an open or the lack of the signal voltage from the PCM.
- 7 This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal "A" should change to LOW.
- 8 This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal "B" should change to LOW.
- 9 This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal "C" should change to LOW.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests for proper transmission fluid level and condition.
- 3 This step verifies which condition has set DTC P0711.
- 5 The 12-volt test light is used as a fixed resistance.
- 6 This step ensures that the PCM monitors the TFT sensor signal circuit (1227).
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests for a short to ground or a skewed sensor by verifying the fault still exists.
- 4 This step tests for an internal fault within the transmission by creating an open.
- 6 This step inspects the TFT sensor signal circuit (1227) of the transmission wiring harness assembly for being shorted to ground.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step verifies a problem in the TFT sensor circuit inside the transmission.
- 5 This step tests for higher than normal circuit voltage which may also damage the TFT sensor.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests for proper operation to the ISS.
- 6 This step tests for proper ISS circuit operation up to the PCM connections. Remove the fuel pump relay to eliminate a flooding condition during this step.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests for proper circuit operation up to the PCM connections. Remove the fuel pump relay to eliminate a flooding condition during this step.
- 5 This step tests for proper operation of the ISS.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests for stoplamp switch voltage to the PCM connector.
- 7 This step isolates the stoplamp switch as a source for setting the DTC.
- 10 This step tests for a short to ground in the ignition 3 voltage circuit (441) to the stoplamp switch.
- 12 This step tests for a short to ground in the brake switch signal circuit (420), from the stoplamp switch to the PCM.
- 13 This step isolates the PCM as a source for causing the fuse to open.
The number listed below refers to step number in the diagnostic procedure
- 3 This step isolates the stoplamp switch as a source for setting the DTC.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch could set DTC P1810.
- 4 This step tests for proper ratios in each commanded gear state.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests for excessive TCC slip when TCC is commanded on.
- 3 This step inspects for possible causes of no TCC apply.
The number listed below refers to step number in the diagnostic procedure
- 3 This step tests the mechanical state of the TCC. When the PCM commands the TCC solenoid off, the slip speed should increase.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests the ability of the PCM to command the PC solenoid valve.
- 3 This step tests the PC solenoid valve and the transmission internal wiring harness assembly for incorrect resistance.
- 6 This step tests the PC solenoid valve and the internal wiring harness for a short to ground.
- 9 This step tests the entire PC solenoid valve circuit up to the PCM for continuity.
- 10 This step tests for a short to ground in the PC solenoid valve high control circuit (1228) and the PC solenoid valve low control circuit (1229) of the engine harness.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests the function of the TFP manual valve position switch.
- 3 This step tests whether the scan tool commanded all the shifts, or whether all the shift solenoids responded correctly, but all of the correct shifts did not occur.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests the function of the TFP manual valve position switch.
- 3 This step tests whether the scan tool commanded all the shifts, or whether all the shift solenoids responded correctly, but all of the correct shifts did not occur.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests the function of the 1-2 shift solenoid valve and the internal wiring harness.
- 5 This step tests the power to the 1-2 shift solenoid valve from the ignition through the fuse.
- 7 This step tests the ability of the PCM and the wiring to control the ground circuit.
- 10 This step measures the resistance of the automatic transmission wiring harness assembly and the 1-2 shift solenoid valve.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests the function of the TFP manual valve position switch.
- 3 This step tests for a selected gear ratio versus a ratio not obtainable under normal operating conditions.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests the function of the TFP manual valve position switch.
- 3 This step tests for a selected gear ratio versus a ratio not obtainable under normal operating conditions.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests the function of the 2-3 shift solenoid valve and the internal wiring harness.
- 5 This step tests the power to the 2-3 shift solenoid valve from the ignition through the fuse.
- 7 This step tests the ability of the PCM and the wiring to control the ground circuit.
- 10 This step measures the resistance of the internal wiring harness assembly and the 2-3 shift solenoid valve.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests the indicated range signal to the manual valve that is actually selected.
- 5 This step tests the voltage from the PCM to the transmission in-line 20-way harness connector.
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 This step tests for voltage to the TCC PWM solenoid valve circuit at the transmission in-line 20-way harness connector.
- 6 This step tests the ability of the PCM and wiring to control the ground circuit.
- 8 This step tests the resistance of the TCC PWM solenoid valve and the internal wiring harness.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch can set a DTC P1870.
- 4 This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 4th gear; and confirms that the fault is present.
- 5 This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in 3rd gear.
- 6 This step tests for a sticking TCC shift valve.
- 8 This step tests for proper transmission line pressure.
The numbers listed below refer to step numbers in the diagnostic procedure
- 3 This step tests for a short to ground in the signal circuit (1694).
- 4 This step tests for an open in the signal circuit (1694), a faulty transfer case control module (active transfer case vehicles) or transfer case switch (non-active transfer case vehicles).
The numbers listed below refer to step numbers in the diagnostic procedure
- 4 By disconnecting the TR switch, the ground path of all TR switch circuits is removed and the PCM should recognize all circuits as open. The scan tool should display HI for all range signal states.
- 5 This step tests the TR switch wiring for an open or the lack of the signal voltage from the PCM.
- 6 This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
- 7 This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
- 8 This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
- 9 This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
The numbers listed below refer to step numbers in the diagnostic procedure
- 2 This step tests for a faulty tow/haul switch.
- 3 This step tests for voltage input from the BCM to the tow/haul switch.
- 6 This step tests for voltage through the body wiring harness junction block.
- 7 This step tests for ground integrity at the splice pack.