P1794
DTC P1794: Ground ReturnDESCRIPTIONS OF MONITOR METHODS
^ With the ignition switch ON, an open circuit is detected for 0.2 seconds.
MONITOR EXECUTION
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ Not applicable
Sensor (The sensor below is determined to be normal)
^ Not applicable
LOGIC FLOW CHARTS (Monitor Sequence)
Logic Flow Charts (Monitor Sequence):
DTC SET CONDITIONS
Check Conditions
^ Voltage of battery: 2 volts or more.
Judgement Criteria
^ Ground voltage level: less than threshold level. (5 seconds)
OBD-II DRIVE CYCLE PATTERN
Start the engine, and keep the vehicle stopped in "P" range for 5 seconds.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Breakage of ground return wire
^ Damaged harness or connector
^ Malfunction of the TCM
DIAGNOSIS
STEP 1. Check between the TCM connector and body ground.
Check for continuity between C-38 TCM connector terminal No. 16 and body ground.
^ Between C-38 terminal No. 16 and body ground: Continuity exists.
Check for continuity between the C-38 TCM connector terminal No. 16 and the C-38 TCM connector terminal No. 13 and No. 26.
^ Between C-38 terminal No. 16 and C-38 terminal No. 13 and No. 26: Continuity exists.
Q:Is the check result normal?
YES: Go to Step6.
NO: Go to Step2.
STEP 2. Check the wiring harness between TCM and the A/T control solenoid valve assembly.
Check for continuity between C-38 TCM connector and B-111 A/T control solenoid valve assembly connector.
^ Between C-38 terminal No. 16 and B-111 terminal No. 13: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Q:Is the check result normal?
YES: Go to Step 3.
NO: Repair or replace the failure section.
STEP 3. Check the wiring harness between the A/T control solenoid valve assembly and body ground.
Check for continuity between B-111 A/T control solenoid valve assembly and body ground.
^ Between B-111 terminal No. 13 and body ground: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Q:Is the check result normal?
YES: Go to Step 5.
NO: Go to Step 4.
STEP 4. Check the wiring harness between the A/T control solenoid valve assembly terminals and ground terminals.
Check for continuity between B-111 A/T control solenoid valve assembly terminals and ground terminals.
^ Between B-111 terminal No. 13 and ground: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Q:Is the check result normal?
YES: Go to Step 5.
NO: Repair or replace the failure section.
STEP 5. Check the TCM, A/T control solenoid valve assembly connector pin terminals, and the connection status.
Q:Is the check result normal?
YES: Replace the TCM.
NO: Repair or replace the failure section.
STEP 6. Check the TCM, A/T control solenoid valve assembly connector pin terminals, and the connection status.
Q:Is the check result normal?
YES: Go to Step 7.
NO: Repair or replace the failure section.
STEP 7. Erase the DTC code, and drive the vehicle for a while.
Check that the normal code is displayed.
Q:Is the check result normal?
YES: The procedure is complete.
NO: Return to START.