Hyundai 20G-7, Service Manual

Page: 414 / 420

4-12
Item Detail
Criterion • During 4 camshaft signals, if there is no CKP pulse signal, determine it as fault
and after this, increase counter per crankshaft signal.
(Determine it together with camshaft position sensor every time)
Troubleshooting
• When fault is detected, there is no corresponding method (Impossible to start
engine)
[NOTE]
After 4 CKP signals, operate main relay and if signal is stopped after 1.8-3.7
seconds, shut off main relay power.
(To determine CKP code in comparison with camshaft position sensor value)
Check lamp
Faulty sensor manage-
ment
• CRANKSHAFT POSITION SENSOR (CPS)
Oxygen sensor/ Related circuit
1. Display crank angular sensor related circuit fault
2. Inspect sensor to ECU wiring or sensor to connector for fault
3. Check sensor surface for foreign material
4. Inspect sensor output.
- At idle: 600-1000Hz
- During cranking, measure between sensor no.1 and no.2 terminals :
(1.8V-2.5V)
No illumination
HI-SCAN • Possible to check oxygen sensor voltage
During this time, supply power to camshaft
position sensor.
I.e. to determine if crankshaft position sen-
sor is faulty or not, start motor should be
rotating for about 3.7 seconds with IG ON
[CAUTION]
If camshaft position sensor is faulty, it is impossible to determine CKP fault
L4GC257A
GENERAL
SEC
Main relay
"ON"
Time
3.7
1.8