ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-117
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 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
1. Fuse box 2. Main fuse box 3. To DLC 4. ECM (PCM)
DTC DETECTING CONDITION TROUBLE AREA
Back-up circuit voltage lower than specification is detected while engine is
running.
• ECM (PCM) back-up circuit
• ECM (PCM)
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Ta bl e ”.
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?
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.
“WHT” circuit open or
short.
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