Honda CR-V 1997 Service Manual page 344

PGM-FI System
Crankshaft Speed Fluctuation (CKF) Sensor
j P1336j The scan tool indicates Diagnostic Trouble Code (DTCI P1336: Intermittent interruption in the Crankshaft Speed
Fluctuation (CKF) sensor Circuit.
j P1337j The scan tool indicates Diagnostic Trouble Code (DTC) P1337: No signal in the Crankshaft Speed Fluctuation (CKF)
sensor Circuit.
Description
The diagnostic system has a pulser rotor on the crankshaft and a pulse pick-up sensor on the engine block. The ECM/PCM
monitors the crankshaft speed fluctuation based on the CKF sensor signal, and judges that an engine misfire occurred if
the fluctuation goes beyond a predetermined limit.
'97 model:
~
- The MIL has been reported on.
n
- OTC P1336 and/or P1337 are
stored.
1
Problem verification:
CKFSENSOR
1.
Do the PCM Reset Procedure.
2.
Start the engine .
1
NO
Intermittent failure. system is OK
Is DTC P1336 and/or P1337
at this time. Check for poor con-
indicated?
nections or loose wires at C104
I
YES
(CKF sensorl and at the PCM.
Check for an open in the CKF
sen~
sor:
1. Turn the ignition switch OFF.
2. Disconnect the CKF sensor 2P
connector.
3. Measure the resistance
between the CKF sensor 2P
connector terminals No. 1 and
No.2.
CKF SENSOR 2P CONNECTOR IC104)
1
......
NO
Replace the CKF sensor (see sec·
Is there 1.6"':" 3.2 kO?
tion 61.
I
YES
Check for a short in the CKF sen-
Terminal side of male terminals
sor:
Check for continuity between
body ground and the CKF sensor
2P connector terminals No.1 and
No.2 individually.
I
......
YES
Replace the CKF sensor (see sec-
Is there continuity?
/ tion
61.
1
NO
~
CKF P
(0) (0)
CKF M
IBLU/RED)
J
r
IWHT/RED)
(To
page 11-143)
11-142