Jeep Liberty KJ. Manual — part 42
HORN SWITCH
DESCRIPTION
The horn switch is molded into the driver airbag. The horn switch can not be serviced separately. For service pro-
cedures, (Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER AIRBAG - REMOVAL).
DIAGNOSIS AND TESTING - HORN SWITCH
For complete circuit diagrams, refer to the appropriate wiring information.
WARNING: Disable the airbag system before attempting any steering wheel, steering column, seat belt ten-
sioner, side airbag, or instrument panel component diagnosis or service. Disconnect and isolate the battery
negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before per-
forming further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take
the proper precautions could result in accidental airbag deployment and possible personal injury.
1. Disconnect and isolate the battery negative cable.
2. Remove the steering column opening cover.
3. Check for continuity between the metal steering column jacket and a good ground. There should be continuity. If
OK, go to Step 4. If not OK, (Refer to 19 - STEERING/COLUMN - INSTALLATION) for proper installation of the
steering column.
4. Remove the driver side airbag module from the steering wheel (Refer to 8 - ELECTRICAL/RESTRAINTS/
DRIVER AIRBAG - REMOVAL). Disconnect the horn switch wire harness connectors from the driver side airbag
module.
5. Remove the horn relay from the Junction Block
(JB). Check for continuity between the steering col-
umn half of the horn switch feed wire (3) harness
connector and a good ground. There should be no
continuity. If OK, go to Step 6. If not OK, repair the
shorted horn relay control circuit to the horn relay
in the Junction Block as required.
6. Check for continuity between the steering column
half of the horn switch feed wire harness connector
and the horn relay control circuit cavity for the horn
relay in the Junction Block. There should be conti-
nuity. If OK, go to Step 7. If not OK, repair the
open horn relay control circuit to the horn relay in
the Junction Block as required.
7. Check for continuity between the horn switch feed
wire and the horn switch ground wire (2) on the
driver side airbag module. There should be no con-
tinuity. If OK, go to Step 8. If not OK, replace the faulty horn switch.
8. Depress the center of the driver side airbag module trim cover (5) and check for continuity between the horn
switch feed wire and the horn switch ground wire on the driver side airbag module. There should now be con-
tinuity. If not OK, replace the faulty horn switch (Refer to 8 - ELECTRICAL/RESTRAINTS/DRIVER AIRBAG -
REMOVAL).
8H - 4
HORN
KJ
IGNITION CONTROL
TABLE OF CONTENTS
page
page
IGNITION SYSTEMS
RELAY-AUTO SHUT DOWN
DESCRIPTION - PCM OUTPUT . . . . . . . . . . . . . . . . . 4
OPERATION
SENSOR-CAMSHAFT POSITION
COIL-IGNITION
SENSOR-KNOCK
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PLUG-SPARK
CLEANING AND ADJUSTMENT . . . . . . . . . . . . . . 16
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SWITCH-IGNITION
SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SWITCH-KEY-IN IGNITION
SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CYLINDER-KEY/LOCK
PLUG-GLOW
MODULE-GLOW PLUG
CAPACITOR-IGNITION COIL
KJ
IGNITION CONTROL
8I - 1
IGNITION SYSTEMS
DESCRIPTION
The ignition system consists of:
•
Spark Plugs
•
Ignition Coil(s)
•
Powertrain Control Module (PCM)
•
Crankshaft Position Sensor
•
2 Knock Sensors (3.7L only)
•
Camshaft Position Sensor
•
The MAP, TPS, IAC and ECT also have an effect on the control of the ignition system.
OPERATION
The 3.7L engine uses a separate ignition coil for each cylinder. The one-piece coil bolts directly to the cylinder head.
Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. A separate electrical
connector is used for each coil.
Because of coil design, spark plug cables (secondary cables) are not used. A distributor is not used.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil. The Powertrain Control Module (PCM)
provides a ground contact (circuit) for energizing each coil. When the PCM breaks the contact, the energy in the coil
primary transfers to the secondary causing a spark. The PCM will de-energize the ASD relay if it does not receive
inputs from either the crankshaft or camshaft position sensors.
SPECIFICATIONS
IGNITION TIMING
Ignition timing is not adjustable on any engine.
ENGINE FIRING ORDER - 3.7L V-6
The engine firing order is: 1 - 6 - 5 - 4 - 3 - 2
IGNITION COIL RESISTANCE - 3.7L V-6
PRIMARY RESISTANCE
21-27°C (70-80°F)
SECONDARY
RESISTANCE 21-27°C
(70-80°F)
0.6 - 0.9 Ohms
6,000 - 9,000 Ohms
SPARK PLUGS
ENGINE
PLUG TYPE
ELECTRODE GAP
3.7L
ZFR6F - 11G (NGK #)
1.1 mm (0.042 in.)
TORQUE
8I - 2
IGNITION CONTROL
KJ
DESCRIPTION
N-m
Ft. Lbs.
In. Lbs.
Camshaft Position Sensor
- 3.7L
12
-
106
Crankshaft Position
Sensor Nut/Bolt - 3.7L
23
21
205
* Knock Sensor Bolt - 3.7L
* 20
* 15
Ignition Coil Mounting
Nuts - 3.7L
8
-
70
Ignition Coil Capacitor
Nuts - 3.7L
8
-
70
Spark Plugs - 3.7L
27
20
-
Do not apply any sealant, thread-locker or adhesive to bolts. Poor sensor performance may result.
* Torque critical tapered design. Do not exceed 15 ft. lbs.
KJ
IGNITION CONTROL
8I - 3
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст