ON-BOARD DIAGNOSTIC
P–27
P
Diagnostic procedure
End Of Sie
DTC C1949, C1950A6E697067650203
Caution
•When attaching the tester lead to the DSC HU/CM connector, the SST (49 G066 004) must be used.
STEP INSPECTION ACTION
1CHECK FOR PCM FOR DTCs
•Turn ignition key to OFF.
•Connect WDS or equivalent to DLC-2
•Turn ignition key to ON (engine OFF).
•Is DTC for engine control system obtained?Yes Follow inspection procedures for engine control system.
No Go to next step.
2MONITOR CAN SIGNAL
•Access PID RPM and TP using WDS or
equivalent.
•Are engine speed and throttle position within
specification?Yes Go to next step.
No Follow inspection procedures for engine control system.
3VERIFY TROUBLESHOOTING COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory.
•Start engine.
•Is same DTC present?Yes Replace DSC HU/CM, then go to next step.
No Troubleshooting completed.
DTC C1949, C1950 Combine sensor (forward G-sensor)
DETECTION
CONDITION•C1949:
—Monitor voltage of forward-G sensor is detected at 4.5 V or more, or 0.5 V or less.
—Monitor voltage difference of 0.4 V or more within 1 cycle is detected 8 times in 1 second.
•C1950:
—Forward-G sensor 0-point correction value is default or more
—Output voltage value from G sensor remains absolutely unchanged
—Difference between estimated G-force calculated from 2 channels exceeds specification
POSSIBLE
CAUSE•Open circuit in harness between combine sensor terminal C and DSC HU/CM terminal P
•Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal V and
combine sensor terminal A
•Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal S and
combine sensor terminal F
•Open circuit in harness between combine sensor terminal E and DSC HU/CM terminal Y
•Malfunction of combine sensor
ON-BOARD DIAGNOSTIC
U–22–1
U
U–22H EA TER AND A I R C O NDI T ION ER SYST EMS
After Repair Procedure
1. Connect the SST (WDS or equivalent) to the
vehicle DLC-2 16-pin connector located as shown
in the figure.
2. Turn the ignition switch to the ON position.
3. Perform the DTCs reading procedure and record
any DTCs that are retrieved.
4. Clear the DTCs using the SST (WDS or
equivalent).
5. Verify that the customer’s concern has been
resolved.
Lockout Reset
Using the SST (WDS or equivalent)
1. Connect the SST (WDS or equivalent) to the
vehicle DLC-2 16-pin connector located as shown
in the figure.
2. Select “CLR_LOCKOUT” and “LOCKOUT”.
3. Turn “CLR_LOCKOUT” to ON using the
simulation function.
4. Verify that the “LOCKOUT” reading changes to
“Unlocked”.
Not using the SST (WDS or equivalent)
For factory equipped water heater unit
1. Turn the ignition switch to the OFF position.
2. Remove the HEATER 20 A fuse from the main
fuse block for more than 5 seconds.
3. Re-install the HEATER 20 A fuse.
For vehicles with a transmitter or timer
1. Turn the ignition switch to the OFF position.
2. Remove the power supply 20 A fuse from the
heater wiring harness for approx. 3 seconds.
3. Re-install the power supply 20 A fuse.
4. Press and hold down the ON switch of the
transmitter or timer for approx. 3 seconds.
5. Remove the power supply 20 A fuse from the
heater wiring harness for approx. 3 seconds.
6. Re-install the power supply 20 A fuse.
ON-BOARD DIAGNOSTIC
DLC-2
A6E3970W002
DLC-2
A6E3970W002
HEATER 20 A FUSE
MAIN FUSE
BLOCK
B6E0740TL02
WAIT FOR
APPROX. 3
SECONDS
OR
ON
ONWAIT FOR
APPROX. 3
SECONDS WAIT FOR
APPROX. 3
SECONDS
B6E0740TL03
