1994 JAGUAR XJ6 Electrical Diagnostic Manual

I:.
Powertrain Automatic Transmission (V12) w
Kickdown Switch System - P1796
Function:
Switch operation monitor.
Connection: TCM Connector
CCO48/024 FCOO7/009
Possible causes:
8 Faulty harness wiring /connection.
8 Faulty switch (or switch adjustment).
Effects:
No kickdown facility.
Remedy:
8 Repair or renew harness / connector.
Re-adjust or renew switch. Switch
in
CA074/001 RHD
FCO19/001 LHD
Ground
CA074/002 RHD
FCO 191002 LH D
Kickdown switch -fault code PI796
Fig. 1

J86 1757
X300 EDM 27 Issue 1 August 1994

Steering 69
SECTION CONTENTS
Sub
-Section Title SRO Page
10.1 ............. System Description ................................................................... 1
10.2.1 ............ Power Steering Control Module ........................................................ 1
10.2.2. ........... Steering Rack Transducer .............................................................. 1
10.2 ............. Component Descriptions .............................................................. 1
10.3 ............. Diagnostics ........................................................................\
. 3
X300 EDM i Issue 1 August 1994

p66t isndnv L anssi 1 vua3 OOEX
ON9 80
N9I 90

Q Steering
I86 177L
1. Instrument pack
2. Steering rack transducer 3. Power steering control module
Fig.
1 Servotronic steering system component locations

Steering @
10.3 DIAGNOSTICS
a Fault: Steering light at all times
Cause: 1. No speed signal
2. Wiring fault
Remedy: 1.
2a.
2b. Check
wiring harness continuity between PSCM pin
V and instrument pack
pin
2.
Check voltage between transducer pin 1 (+ve) and ground, with ignition
ON. If 12V is recorded repair or renew harness.
Check wiring between transducer pin
2 (-ve) and OV. If OV is recorded
repair or renew harness.
Fault: Steering heavy at all times
Cause: 1. Fuse blown
2. Wiring fault
Remedy: 1.
2a.
2b.
2c.
2d Examine
fuse F12 in
RH heelboard fuse-box, if blown determine reason for
failure and renew.
Check wiring harness continuity between fuse F12 in
RH heelboard
fuse
-box and PSCM pin V.
Check wiring harness continuity between PSCM pin W1 and transducer
pin 1.
Check wiring harness continuity between PSCM pin W2 and transducer
pin
2.
Check voltage between transducer pin 2 and ground, with ignition ON. If
12V is recorded repair or renew harness and renew PSCM.
Fault:
Cause:
1. Short circuit
Remedy:
Steering becomes heavy during driving until ignition cycled
la.
1 b.
Check resistance between transducer pins 1 and 2. If a value below 7.5f is
recorded renew transducer.
Check resistance of wiring harness between transducer connections. If
short circuit is recorded renew harness.
Note: Operation ofthe PSCM can bechecked using Jaguar Diagnostic Equipment. Generation of input speed signals
and measurement of the resulting current outputs indicate
if PSCM is faulty.
X300 EDM 3 Issue 1 August 1994

@ Steering
R
. WIP
+ Y
1- -------q I I +I" I
*Ti m) wp I
+12V PRESENT ONLY WHEN IGNITION ON
1. STEERING RACK TRANSDUCER 2. POWER STEERING CONTROL MODULE (PSCM) 3. INSTRUMENT PACK
i"
J86-1782
Fig. 1 Servotronic steering -schematic circuit

Brakes (a)
SECTION CONTENTS
Sub-section Title SRO Page
12.1 ............. Component Locations .............................................................. 1
12.2 ............. System Description ................................................................. 2
12.3
............. Component Descriptions ............................................................ 5
12.4 ............. System Fault Indication ............................................................. 6
X300 EDM i Issue 1 August 1994