Operation CHARM: Car repair manuals for everyone.
Hosted by mcallihan.com
Home >> Jaguar >> 2008 >> X-Type (X400) V6-3.0L >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Pinpoint Tests >> PINPOINT TEST G457389p1

PINPOINT TEST G457389p1



Pinpoint Tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00. Failure to follow this instruction may result in damage to the vehicle.

NOTE:
- This section contains references to Parameter Identifiers (PIDs). Where the Jaguar approved diagnostic system is not available, a scantool may be used to access these PIDs, all of which give information, and some of which can be used to both read information and to activate components. The format of the information may vary, depending on the tool used.
- When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
- Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- If a DTC is detected, all DTCs must be cleared after the concern is repaired. Failure to clear all DTCs may cause driveability concerns.

PINPOINT TEST G457389p1 : AUXILIARY HEATER RELAY 1

G457389t1 : CHECK THE AUXILIARY HEATER RELAY CIRCUIT FOR SHORT CIRCUIT TO POWER

1.






2.







3.







4.







5. Key off.
6. Auxiliary heater fuse removed.
7. Measure the resistance between:

Auxiliary heater fuse connector Vehicle battery
Auxiliary heater 1 control, pin 02 Positive post

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t3.

-> NO
GO to Pinpoint Test G457389t2.

G457389t2 : CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE HARNESS OR THE AUXILIARY HEATER UNIT

1. Auxiliary heater 1 connector disconnected.
2. Measure the resistance between:

Auxiliary heater fuse connector Vehicle battery
Auxiliary heater 1 control, pin 02 Positive post

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - Auxiliary heater 1 assembly

-> NO
REPAIR the short circuit.

G457389t3 : CHECK THE AUXILIARY HEATER 1 CIRCUIT CONTINUITY
1. Auxiliary heater 1 connector disconnected.
2. Measure the resistance between:

Auxiliary heater fuse connector Vehicle battery
Auxiliary heater 1 control, pin 02 Negative post

- Is the resistance between 0.5 Ohms and 10 Ohms?

-> YES
GO to Pinpoint Test G457389t6.

-> NO
GO to Pinpoint Test G457389t4.

G457389t4 : CHECK THE AUXILIARY HEATER CONTROL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Auxiliary heater connector disconnected.
3. Key on, engine off.
4. Measure the resistance between:

Auxiliary heater 1 fuse Vehicle battery
connector
Auxiliary heater 1 control, pin 02 Negative post

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t5.

-> NO
REPAIR the short circuit.

G457389t5 : CHECK THE AUXILIARY HEATER 1 CIRCUIT(S) FOR OPEN CIRCUIT IN THE HARNESS
1. Measure the resistance between:

Auxiliary heater 1 fuse Auxiliary heater 1 assembly
connector connector, harness side
Auxiliary heater 1 control, pin 02 Auxiliary heater 1 control, pin 01

- Is the resistance less than 10 Ohms?

-> YES
SUSPECT: - Auxiliary heater 1 assembly - Auxiliary heater 1 ground

-> NO
REPAIR the open circuit.

G457389t6 : CHECK THE AUXILIARY HEATER 1 CONTROL LINE 'ON' STATE
1. Scan tool connected.
2. Access the ECM and control the auxiliary heater 1 relay PID.
3. Activate the auxiliary heater 1.
4. Measure the voltage between:

Auxiliary heater 1 fuse Vehicle battery
connector
Auxiliary heater relay 1 Negative post
output, pin 01

- Is the voltage between 9 volts and 15 volts?

-> YES
GO to Pinpoint Test G457389t10.

-> NO
GO to Pinpoint Test G457389t7.

G457389t7 : CHECK THE AUXILIARY HEATER 1 CONTROL LINE FOR SHORT TO GROUND
1. Measure the resistance between:

Auxiliary heater 1 fuse Vehicle battery
connector
Auxiliary heater relay 1 Negative post
output, pin 01

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t8.

-> NO
REPAIR the short circuit.

G457389t8 : CHECK THE ECM CONTROL LINE 'ON' STATE
1. Key off.
2. Junction box connector disconnected.
3. Key on, engine off.
4. Scan tool connected.
5. Access the ECM and control the auxiliary heater 1 relay PID.
6. Activate the auxiliary heater 1.
7. Measure the resistance between:

Junction box harness Vehicle battery
connector, component side
Auxiliary heater relay 1 Negative post
control, Pin 38

- Is the resistance less than 10 Ohms?

-> YES
SUSPECT: - Short circuit to power in the harness between the junction box harness and the fuse box connectors - Open circuit in the harness between the junction box harness and the fuse box connectors - Fusebox assembly

-> NO
GO to Pinpoint Test G457389t9.

G457389t9 : CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Junction box harness Vehicle battery
connector, component side
Auxiliary heater relay 1 Positive post
control, Pin 38

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t14.

-> NO
GO to Pinpoint Test G457389t13.

G457389t10 : CHECK THE AUXILIARY HEATER 1 CONTROL LINE 'OFF' STATE
1. Scan tool connected.
2. Access the ECM and control the auxiliary heater 1 relay PID.
3. De-activate the auxiliary heater 1.
4. Measure the resistance between:

Auxiliary heater 1 fuse Vehicle battery
connector
Auxiliary heater relay 1 Positive post
output, pin 01

- Is the resistance greater than 10 Ohms?

-> YES
An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): - Fuse - ECM connector - Fusebox assembly - ECM

-> NO
GO to Pinpoint Test G457389t11.

G457389t11 : ELIMINATE THE ECM FROM THE POSSIBLE CAUSES
1. Key off.
2. ECM connector disconnected.
3. Key on, engine off.
4. Measure the resistance between:

Auxiliary heater 1 fuse Vehicle battery
connector
Auxiliary heater relay 1 Negative post
output, pin 01

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - ECM

-> NO
GO to Pinpoint Test G457389t12.

G457389t12 : CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

ECM connector, harness side Vehicle battery
Engine coolant heater relay Negative post
1 control, pin 61

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - Fusebox assembly

-> NO
REPAIR the short circuit.

G457389t13 : CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ECM HARNESS OR THE MODULE
1. Key off.
2. ECM connector disconnected.
3. Key on, engine off.
4. Measure the resistance between:

Junction box connector, Vehicle battery
harness side
Engine coolant heater Positive post
relay 1 control, pin 38

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - ECM

-> NO
REPAIR the short circuit.

G457389t14 : CHECK THE ECM CONTROL LINE FOR CONTINUITY
1. Key off.
2. ECM connector disconnected.
3. Measure the resistance between:

Junction box connector, ECM connector, harness side
harness side
Auxiliary heater relay 1 Auxiliary heater relay
control, pin 38 1 control, pin 61

- Is the resistance less than 10 Ohms?

-> YES
SUSPECT: - ECM connector - ECM

-> NO
REPAIR the open circuit.
pro multis · About Operation CHARM