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Home >> Jaguar >> 2008 >> X-Type (X400) V6-3.0L >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Pinpoint Tests >> PINPOINT TEST G457389p3

PINPOINT TEST G457389p3



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 G457389p3 : AUXILIARY HEATER CIRCUIT TESTS

G457389t27 : CHECK THE AUXILIARY HEATER CIRCUITS FOR SHORT CIRCUIT TO POWER
1.







2.







3.







4.







5. Key off.
6. Auxiliary heater fuse removed.
7. Key on, engine off.
8. Measure the resistance between:

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

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t29.

-> NO
GO to Pinpoint Test G457389t28.

G457389t28 : CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE HARNESS OR THE AUXILIARY HEATER
1. Auxiliary heater connector disconnected.
2. Measure the resistance between:

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

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - Auxiliary heater assembly

-> NO
REPAIR the short circuit.

G457389t29 : CHECK THE AUXILIARY HEATER CIRCUIT CONTINUITY
1. Measure the resistance between:

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

- Is the resistance between 0.5 Ohms and 10 Ohms?

-> YES
GO to Pinpoint Test G457389t32.

-> NO
GO to Pinpoint Test G457389t30.


G457389t30 : CHECK THE AUXILIARY HEATER CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Auxiliary heater connector disconnected.
2. Measure the resistance between:

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

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t31.

-> NO
REPAIR the short circuit.

G457389t31 : CHECK THE AUXILIARY HEATER CIRCUIT(S) FOR OPEN CIRCUIT IN THE HARNESS
1. Measure the resistance between:

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

- Is the resistance less than 10 Ohms?

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

-> NO
REPAIR the open circuit.

G457389t32 : CHECK THE AUXILIARY HEATER CONTROL LINE 'ON' STATE
1. Scan tool connected.
2. Access the ECM and control the auxiliary heater control PID.
3. Activate the auxiliary heater.
4. Measure the voltage between:

Auxiliary heater fuse Vehicle battery
connector, harness side
Glow plug relay output, Negative post
pin 01

- Is the voltage between 9 volts and 15 volts?

-> YES
GO to Pinpoint Test G457389t38.

-> NO
GO to Pinpoint Test G457389t33.

G457389t33 : CHECK THE AUXILIARY HEATER CONTROL LINE FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Auxiliary heater relay connector disconnected.
3. Key on, engine off.
4. Measure the resistance between:

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

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t34.

-> NO
INSTALL a new front power distribution box.


G457389t34 : CHECK THE AUXILIARY HEATER CONTROL LINE FOR CONTINUITY
1. Measure the resistance between:

Auxiliary heater fuse Auxiliary heater relay
connector, harness side connector, harness side
Auxiliary heater relay Auxiliary heater relay
output, pin 01 output, pin 05

- Is the resistance less than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t35.

-> NO
REPAIR the open circuit.

G457389t35 : CHECK THE SUPPLIES TO THE AUXILIARY HEATER RELAY
1. Measure the voltage between:

Auxiliary heater relay Vehicle battery
connector, harness side
ECM relay controlled 12 Negative post
volt supply, pin 01
Permanent 12 volt supply, Negative post
pin 03

- Are the voltages between 9 volts and 15 volts?

-> YES
GO to Pinpoint Test G457389t36.

-> NO
REPAIR the supply to the auxiliary heater.

G457389t36 : CHECK THE ECM CONTROL LINE 'ON' STATE
1. Scan tool connected.
2. Access the ECM and control the auxiliary heater PID.
3. Activate the auxiliary heater.
4. Measure the resistance between:

Auxiliary heater relay Vehicle battery
connector, harness side
Auxiliary heater relay Negative post
control, pin 02

- Is the resistance less than 10 Ohms?

-> YES
SUSPECT: - Auxiliary heater connector - Auxiliary heater assembly

-> NO
GO to Pinpoint Test G457389t37.

G457389t37 : CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Auxiliary heater relay Vehicle battery
connector, harness side
Auxiliary heater relay Negative post
control, pin 02

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t43.

-> NO
GO to Pinpoint Test G457389t42.


G457389t38 : CHECK THE AUXILIARY HEATER CONTROL LINE 'OFF' STATE
1. Scan tool connected.
2. Access the ECM and control the auxiliary heater PID.
3. De-activate the auxiliary heater.
4. Measure the resistance between:

Auxiliary heater fuse Vehicle battery
connector, harness side
Auxiliary heater relay 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): - Auxiliary heater fuse connector - Auxiliary heater fuse

-> NO
GO to Pinpoint TestG457389t39.


G457389t39 : CHECK THE AUXILIARY HEATER CIRCUIT FOR SHORT CIRCUIT TO POWER IN THE HARNESS
1. Key off.
2. Auxiliary heater relay connector disconnected.
3. Key on, engine off.
4. Measure the resistance between:

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

- Is the resistance greater than 10 Ohms?

-> YES
GO to Pinpoint Test G457389t40.

-> NO
INSTALL a new front power distribution box.

G457389t40 : CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

Auxiliary heater relay Vehicle battery
connector, harness side
Auxiliary heater relay Negative post
control, pin 02

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - Auxiliary heater relay

-> NO
GO to Pinpoint Test G457389t41.

G457389t41 : CHECK WHETHER THE SHORT CIRCUIT TO GROUND 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:

Auxiliary heater relay Vehicle battery
connector, harness side
Auxiliary heater relay Negative post
control, pin 02

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - ECM

-> NO
REPAIR the short circuit.

G457389t42 : 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:

Auxiliary heater relay Vehicle battery
connector, harness side
Auxiliary heater relay Positive post
control, pin 02

- Is the resistance greater than 10 Ohms?

-> YES
SUSPECT: - ECM

-> NO
REPAIR the short circuit.

G457389t43 : CHECK THE ECM CONTROL LINE FOR CONTINUITY
1. Key off.
2. ECM connector disconnected.
3. Measure the resistance between:

Auxiliary heater relay ECM connector, harness side
connector, harness side
Auxiliary heater relay Auxiliary heater control,
control, pin 02 pin 20

- Is the resistance less than 10 Ohms?

-> YES
SUSPECT: - ECM - ECM connector

-> NO
REPAIR the open circuit.
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