Suzuki SY413 Service Manual page 2698

DTC P1510 ECM (PCM) BACK-UP POWER SUPPLY MALFUNCTION
CIRCUIT DESCRIPTION
Main
fuse
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM
(PCM), etc. are kept in ECM (PCM) even when the ignition switch is turned OFF.
DTC DETECTING CONDITION
D Low voltage at terminal E92-7 after starting engine.
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and run it at idle for 1 min.
2) Select "DTC" mode on scan tool and check DTC.
INSPECTION
STEP
1 Check for voltage at terminal E92-7 of ECM
(PCM) connector connected, under each condi-
tion, ignition switch OFF and engine running.
Is it 10 – 14 V at each condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC) 6-1-99
Relay box
ACTION
POSSIBLE CAUSE
D "W" circuit open
D ECM (PCM) malfunction
YES
Poor E92-7 connection or in-
termittent trouble.
Check for intermittent refer-
ring to "Intermittent and Poor
Connection" in Section 0A.
If wire and connections are
OK, substitute a known- good
ECM (PCM) and recheck.
ECM
(PCM)
NO
"W / Bl" circuit open.