Suzuki 2000 Grand Vitara SQ625 Service Manual page 102

6-98 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
DTC P1510 ECM BACK-UP POWER SUPPLY MALFUNCTION
WIRING DIAGRAM
CIRCUIT DESCRIPTION
Battery 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 DETECTING CONDITION
Back-up circuit voltage lower than specification is
detected while engine is running.
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and run engine
at idle speed for 1 min.
3) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Battery Voltage Supply Circuit Check:
1) Remove ECM (PCM) cover.
2) While engine running, check voltage between
E61-2 and ground.
Is voltage 10 – 14 V?
ACTION
TROUBLE AREA
D ECM (PCM) back-up circuit
D ECM (PCM)
YES
Go to Step 2.
Poor E61-2 connection
or intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection"
in Section 0A.
If wire and connections
are OK, substitute a
known-good ECM
(PCM) and recheck.
1. Fuse box
2. Main fuse box
3. To DLC
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
"W" circuit open
or short.