MARUTI SUZUKI Wagon R, Manual

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Engine General Information and Diagnosis: Bi-Fuel LPG model 1A-48
LPG Warning Light Remains ON after Engine Starts
AENAR90A1104016
Wiring Diagram
Refer to “LPG Warning Light Does Not Come ON with Ignition Switch in ON Position and Engine Stopped”: Bi-Fuel
LPG model.
Circuit Description
Refer to “LPG Warning Light Does Not Come ON with Ignition Switch in ON Position and Engine Stopped”: Bi-Fuel
LPG model.
Troubleshooting
DTC P0601 / P0602 (ECM)
AENAR90A1104056
DTC Detecting Condition and Trouble Area
System Description
Internal control module is installed in ECM.
DTC Confirmation Procedure
1) Turn ignition switch to ON position.
DTC Troubleshooting
DTC U0073 (ECM)
AENAR90A1104036
Refer to “CAN DTC (Lost Communication and
Communication Bus Off) Table”: in Section 10H.
DTC U0108
AENAR90A1104037
Refer to “CAN DTC (Lost Communication and
Communication Bus Off) Table”: in Section 10H.
DTC U0155
AENAR90A1104038
Refer to “CAN DTC (Lost Communication and Communication Bus Off) Table”: in Section 10H.
Step Action Yes No
1 DTC check
1) Start engine and recheck DTC of LPG control module
while engine running.
Is there any DTC(s)?
Go to troubleshooting
for applicable DTC. Substitute a known-
good combination meter
and recheck. If LPG
warning light still
remains ON, substitute
a known-good LPG
control module and
recheck.
DTC detecting condition Trouble area
P0601: Internal Control Module Memory Check Sum Error
Data write error or check sum error
(2 D/C detection logic, mounting once per D/C)
• ECM power supply circuit and/or ground circuit
• ECM
P0602: Control Module Programming Error
Data programming error
(1 D/C detection logic but MIL does not light up)
Step Action Yes No
1 DTC recheck
1) Clear DTC. )
2) Turn ignition switch to OFF position.
3) Perform DTC confirmation procedure, and check DTC.
Is DTC P0601 or P0602 still detected?
Go to Step 2. Check for intermittent
trouble.
)
2 ECM power and ground circuit check
1) Check ECM power supply circuit and ECM ground circuit
is in good condition.
)
Are they in good condition?
Substitute a known-
good ECM and recheck. Repair or replace
defective wire harness.