Suzuki Grand Vitara JB627. Manual - part 49
1A-145 Engine General Information and Diagnosis:
DTC Troubleshooting
DTC P1510: ECM Back-Up Power Supply Malfunction
S6JB0B1104056
Wiring Diagram
Circuit Description
Battery voltage is translated to 5 V in ECM back-up circuit. The voltage is supplied to keep DTC memory, values that
ECM has learned to control engine, etc. in ECM even when ignition switch is turned OFF.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and run it for 10 sec.
4) Check DTC by using scan tool.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check”.
2
MAP sensor check
1) Check MAP sensor for performance referring to
“Manifold Absolute Pressure (MAP) Sensor Inspection in
Section 1C”.
Is it in good condition?
Go to Step 3.
Replace MAP sensor.
3
Wire harness check
1) Check power supply, signal and ground circuits of MAP
sensor for connection and high resistance referring to
Step 3 of “DTC P0107 / P0108: Manifold Absolute
Pressure Sensor Circuit Low / High Input”.
Is it in good condition?
Substitute a known
good ECM and recheck.
Repair or replace.
WHT
E23-1
WHT
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E23
C37
1
2
I6JB01110052-03
1. ECM
2. “DOME” fuse
DTC detecting condition
Trouble area
Backup power voltage of internal circuit is lower than 3 V or more than 7 V.
(1 driving cycle detection logic)
• Battery voltage supply circuit
• ECM