Suzuki WagonR+ RB310 Service Manual page 2457

6-98 ENGINE DIAGNOSIS
DTC P1510 ECM BACK-UP POWER SUPPLY MALFUNCTION
CIRCUIT DESCRIPTION
Main
fuse
"LAMP"
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM, etc.
are kept in ECM even when the ignition switch is turned OFF.
DTC DETECTING CONDITION
D Low voltage at terminal E22-7 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 E22-7 of ECM
connector connected, under each condition,
ignition switch OFF and engine running.
Is it 10 – 14 V at each condition?
Fuse box
DOME
RADIO
ACTION
POSSIBLE CAUSE
D "W/Bl" circuit open
D ECM malfunction
YES
Poor E22-7 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 and
recheck.
NO
"W/Bl" circuit open.