1998 OPEL FRONTERA Workshop Manual

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Page 5577 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–148
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1487 (Flash DTC 73)
Intake Throttle System Circuit Open/Start
060RW134
Circuit Description
The intake throttle posi

Page 5578 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–149 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1487 – Intake Throttle System Circuit Open/Short
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
perfor

Page 5579 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–150
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1488 (Flash DTC 72)
Intake Throttle Motor Control Circuit Signal Gap
060RW135
Circuit Description
The Intake thrott

Page 5580 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–151 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1488 – Intake Throttle Motor Control Circuit Signal Gap
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”

Page 5581 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–152
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0502 (Flash DTC 24)
VSS (Vehicle Speed Sensor) No Signal
060RW136
Circuit Description
The vehicle speed sensor

Page 5582 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–153 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
10. To avoid backprobing the VSS and possibly
damaging

6E–153 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
10. To avoid backprobing the VSS and possibly
damaging a seal or terminal, the VSS output can be
tested at the point where the transmission harness
connected to the engine harness. The green 16-way
connector is adjacent to a blue 16-way connector,
and it can be easily accessed by removing the air
cleaner assembly. The green 16-way connector is
separated, and battery voltage is applied to the VSS
through the yellow wire at one corner of the
connector. The VSS output can be monitored with a
DVM connected to the blue wire with a black tracer.
The two wires are next to each other in the 16-way
connector . The test connections are made on the
transmission side of the connector, the side that is
not clipped to the body sheetmetal.11. The speedometer-to-ECM VSS signal wire is
spliced to a wire leading to the cruise control
module. If a short to ground or voltage is found
between the ECM and speedometer, it could be
located between the splice and the cruise control
module.
DTC P0502 –VSS No Signal
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Does the speedometer work?—Go to Step 10Go to Step 3
31. Disconnect the VSS connector.
2. Ignition “ON.”
3. Using a test light to battery +, probe the connector
ground wire.
Did the light illuminate?
—Go to Step 5Go to Step 4
4Repair the sensor ground.
Is the action complete?
—Verify repair—
51. Ignition “ON,” sensor disconnected.
2. Using a DVM, measure at the VSS connector
between ground and voltage supply.
Was the measurement near the specified value?
Battery
voltage
Go to Step 7Go to Step 6
6Repair the open or short to ground which may have
blown the meter fuse.
Is the action complete?
—Verify repair—
71. Ignition “ON,” VSS disconnected.
2. Using a DVM, measure at the VSS connector
between ground and the blue/black wire from the
speedometer.
Was the measurement near the specified value?
7.5-8 VGo to Step 9Go to Step 8
8Check for an open or short circuit between the
speedometer and the VSS.
Was an open or short circuit located?
—Verify repairGo to Step 9
9Replace the VSS.
Is the action complete?
—Verify repairGo to Step 10
10Replace the speedometer.
Is the action complete?
—Verify repairGo to Step 11

Page 5583 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–154
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0502 –VSS No Signal
StepNo Ye s Va l u e ( s ) Action
11Check for an open or short between the ECM and the
speedometer.
Was a problem found?

Page 5584 of 6000

OPEL FRONTERA 1998 Workshop Manual 6E–155 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0510 (Flash DTC 75)
Idle SW Malfunction, Open Circuit
060RW134
Circuit Description
The idle switch signal is u

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