what happens to the pin2 voltage with ignition completely off ?
6th Jan 2018 3:31 pm
jonathanCrisp
Member Since: 27 Apr 2015
Location: UK
Posts: 24
With the ignition off pin 2 drops to 0.15v and pin 1 drops to 0v - the load side stays the same
6th Jan 2018 4:12 pm
Allan_T
Member Since: 10 Sep 2012
Location: Northampton
Posts: 1034
The starter relay's power & ground are both module controlled . Your symptoms indicate the starter relay is not being provided a ground with the ignition in the crank position.
Check fuse 60 5A in the passenger compartment fusebox, this is the crank input from the ignition switch to the CJB. If this has blown, there will be a missing input.
Your bypass test on the starter relay has confirmed circuit integrity on the load side of the relay, as well as the starter circuit.
If you own a suitable diagnostic tool the ignition switch input status can be monitored under live data values, this will confirm the CJB is receiving the correct switch state.GAP IID Pro Multi Vehicle Defender L316 2007-2015 - Discovery 3 - Discovery 4 - Discovery Sport L550 - Freelander 2 - Range Rover Evoque L538 - Range Rover L322 - Range Rover L405 - Range Rover Sport L320 - Range Rover Sport L494 Electrical Fault Diagnostics
6th Jan 2018 4:31 pm
jonathanCrisp
Member Since: 27 Apr 2015
Location: UK
Posts: 24
In the link to the wiring diagram below i can see the 2 pins for the control side of the relay go to C0193-10 on the Transmission Control Module and to C0635-51 and C0635-15 on the Engine control module (ECM).
The car seems to run fine once it's cranked and started.
1) Put a test light on fuse 60 (by glovebox) and see if the light comes on when you crank the key.
2 or apply + power to fuse 60 and see if that causes the engine to start (with ign on)
Last edited by Pete K on 20th Apr 2021 10:56 am. Edited 1 time in total
6th Jan 2018 5:54 pm
jonathanCrisp
Member Since: 27 Apr 2015
Location: UK
Posts: 24
Appreciate the suggestions guys.
Have put my name down for an IID Tool in another thread.
Also, tested the signal on Fuse 60P and looks good.
Get no test light on ignition 'off' or 'on' - and get the test light on ignition 'crank'.
Would you know (without me having to lift the BJB) which wire is which for pins 1 and 2 on the relay?
According to the wiring diagram there's a purple wire and a green wire - purple goes to the Starter Relay pin on the ECU and green goes to the P/N pin on the ECU and also to the TCM.
Just wondering which one is the one that's supposed to go to ground on crank.
Thanks in advance
7th Jan 2018 11:55 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10722
I'm not sure an IID will help with this one
what a headache
I guess the ground comes from the blue/red eng. ecm. (as there is a - after the name)
I wouldn't waste time lifting the fusebox.
Just remove the battery, to gain access to the engine ecu. I think its the one with 3 plugs behind the battery? confirm it. (Although you have a petrol so could be different)
You should then be able to see the two coloured wires as both goto eng. ecu.
With relay removed, buzz out the wires.
Are guess you are happy its not the imboliser ? as the car starts
ok ... if the module has a function other than starting the engine then it's a bit odd that all is good other than cranking.
If it had been otherwise, I'd have suggested finding the point the module is earthed at ... but that might be worth trying anyway in case it's "good enough for low amps" but not so when more current is flowing through it.
7th Jan 2018 12:46 pm
jonathanCrisp
Member Since: 27 Apr 2015
Location: UK
Posts: 24
I believe i can monitor the following for PETROL ENGINE MANAGEMENT - (This is divided into 4 sections)
FUEL TRIM, TEMPERATURE, & KNOCK SENSOR
TERRAIN, RATIO, & POSITION
VOLTAGE & CYLINDERS
SWITCHES & SENSORS
Under Switches and Sensors i've highlighted in red ->
Brake Switch x2:
Park/Neutral Or Clutch Switch:
Crank Request Input:
Ignition Switch Input:
Starter Motor Relay Monitor Status:
Engine Input 1 x8:
Viscous Fan Control Duty Cycle:
Engine Input 1 - Idle Jack Active x4:
Engine Input 3 - Ignition Switch:
Pedal Position Sensor 2:
Throttle Position Sensor (V) x2:
Airflow Meter Sensor Voltage (V):
Engine Oil Temperature Sensor Voltage (V):
Manifold Absolute Pressure Sensor Voltage (V):
O2 Sensor x8:
I can monitor the following for TRANSMISSION CONTROL MODULE - (This is divided into 3 sections)
SPEED, TEMPERATURE, PRESSURE, & CONTROL
SOLENOID STATES & SIGNAL INFORMATION
SENSORS & SWITCHES
Under Switches and Sensors i've highlighted in red ->
Transmission Oil Temperature Sensor Voltage (V) x2:
Power Supply Sensor Voltage (V):
Current Engine Torque (Nm):
Absolute Throttle Position (%):
Engine Oil Temperature (°C):
Status Of The Ignition On/Off Switch:
Transmission Oil Temperature (°C):
TCM Internal Module Temperature (°C):
Actuator Supply Voltage (V):
Park Or Neutral Signal For Starter Inhibit:
Key Lock Output State:
Shift Lock Solenoid Signal:
Control Module Supply Voltage (V):
Engine Speed (RPM):
7th Jan 2018 1:54 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8240
Could it be the brake peddle switch?It can when others can't,
It will when others won't,
It goes where others don't.
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