Impco HHI, Service Manual

Page: 271 / 485

271
DTC 337-Crank Loss
Step Action Value(s) Yes No
1
Did you perform the On-Board (OBD) System
Check? Go to Step
(2)
Go to OBD
System
Check Sec-
tion
2

Check that the ECM ground terminal CN28 is
clean, tight and in the proper location
Are the ground terminals clean and tight?
Go to Step
(3)
Repair the
circuit as
necessary.
Refer to Wir-
ing Repairs
in Engine
Electrical.
3

Key OFF

Disconnect the CKP (Crankshaft Position)
Sensor connector CN9

Using A DVOM check for voltage at the CKP
sensor connector CN9 circuit 119 and engine
ground
( CHECK THIS BEFORE THE POWER RELAY
SHUTS OFF )
Do you have voltage?
5.0 volts
Go to Step
(4)
Repair the
circuit as
necessary.
Refer to Wir-
ing Repairs
in Engine
Electrical.
4

Key OFF

Disconnect ECM connector CN1

Using a DVOM check for continuity on crank
signal circuit 125 between CKP connector
and ECM connector
Do you have continuity between them?
Go to Step
(5)
Repair the
circuit as
necessary.
Refer to Wir-
ing Repairs
in Engine
Electrical.
5

Using a DVOM check for continuity on the
sensor ground circuit 120 between CKP con-
nector CN9 and ECM connector CN1
Do you have continuity between them?
Go to Step
(6)
Repair the
circuit as
necessary.
Refer to Wir-
ing Repairs
in Engine
Electrical.
6

Inspect the CKP connector CN9 terminals for
damage, corrosion or contamination
Did you find a problem?
Repair the
circuit as ne-
cessary.
Refer to Wir-
ing Repairs in
Engine Elec-
trical.
Go to Step
(7)