Suzuki 2000 Grand Vitara SQ625 Service Manual page 81

TROUBLESHOOTING (DTC P0340/DTC No.42)
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Is engine cranked?
3 Is there DTC P1500 (Engine starter signal circuit)?
4 Check CMP Sensor and connector for proper installation.
Is CMP sensor installed properly and connector
connected securely?
5 Check Wire Harness and Connection.
1) Disconnect connector from CMP sensor.
2) Check for proper connection to CMP sensor at
each terminal.
3) If OK, turn ignition switch ON and check for voltage
between "Bl/B" and "V/R" terminals of sensor
connector disconnected.
Is voltage 10 – 14 V?
6 Check for voltage between "Y/Bl" and "V/R" terminals of
sensor connector disconnected.
Is voltage 4 – 5 V?
7 Check CMP Sensor for Operation.
G16 Engine:
1) Remove CMP sensor from sensor case.
2) Remove metal particles on end face of CMP sensor,
if any.
3) Connect connector to CMP sensor.
Disconnect connectors from ignition coil assemblies
and fuel injectors.
4) Turn ignition switch ON.
5) Check for voltage at terminal C51-2-26 of connector
connected to ECM (PCM) by passing magnetic
substance (iron) while keeping approximately 1 mm
(0.03 in.) gap with respect to end face of CMP sensor.
Does voltage vary from low (0 – 1 V) to high (4 – 6 V)
or from high to low?
J20 Engine:
1) Remove CMP sensor.
2) Connect connector to CMP sensor.
Disconnect connectors from ignition coil assemblies
and fuel injectors.
3) Turn ignition switch ON.
4) Check for voltage between C51-2-26 and C51-3-26
of connector connected to ECM (PCM) by rotating
CMP sensor coupling.
Does voltage vary from low (0 – 1 V) to high (4 – 6 V) or
from high to low?
ACTION
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-77
YES
Go to Step 2.
Go to Step 3.
Go to DTC P1500
Diag. Flow Table.
Go to Step 5.
Go to Step. 6.
Go to Step 5.
Go to Step 8.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to "CRANKING
SYSTEM" section.
Go to Step 4.
Correct.
"Bl/B" or "V/R" wire
open, short or poor
connection.
"Y/Bl" wire open,
short or poor
connection.
If wire and connec-
tion are OK, substi-
tute a known-good
ECM (PCM) and
recheck.
Replace CMP
sensor.