Suzuki 2000 Grand Vitara SQ625 Service Manual page 99

TROUBLESHOOTING (DTC P1408)
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 MAP Sensor Signal Check:
1) Remove ECM (PCM) cover.
2) Check voltage between C51-3-8 and C51-3-22
under following conditions.
With ignition switch ON leaving engine OFF:
0.2 V or higher
At idling: 4.6 V or lower
Is check result as specified?
3 MAP Sensor Check:
1) Disconnect connector from MAP sensor.
2) Check for proper connection to MAP sensor at each
terminal.
3) If OK, check MAP sensor for performance referring to
"MAP Sensor Inspection" in Section 6E1.
Is check result satisfactory?
ACTION
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-95
YES
Go to Step 2.
Intermittent trouble
or faulty ECM
(PCM).
Check for intermit-
tent referring to
"Intermittent and
Poor Connection"
in Section 0A.
"R /W", "Bl/R" or
"W/R" circuit open/
short.
If wire and connec-
tions are OK, substi-
tute a known-good
ECM (PCM) and
recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Replace MAP
sensor.