Inertia fuel safety cutoff switch, engine cranks does not start

Hello my name is Dave.

No, it does not have an inertia switch and if it did the pump would not be running. It sounds like the most likely issue is the new key. When you put the key in switch does the security light flash or stay on? If it does then the key isn't programmed properly to your car. If the light is not on then I am concerned you overlooked something in the process of changing the heater core in which case it's a matter of back tracking until you find it.

If you can check on the security light and let us know what you find we will be happy to help you track down the issue unfortunately a security issue can cause the same symptoms as other issues so we need to eliminate that as the cause before we start trying to find other problems. Please keep us to date on your progress and thank you for using 2CarPros!

Hello again.

As far as the scanner if you have easy access to one certainly can't hurt. As far as the brake light switch the schematics show that it isn't part of the starting circuit. I have attached a copy of the wiring diagram for the starting circuit and hopefully that will help you track down the issue. I suspect it has something to do with the terminal block in the driver's foot-well. Hopefully this will help you track down the issue. Here are a few links to some of our tutorials that you might find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I was also wanting to make sure you have made sure that the battery is fully charged, here is a link to our tutorial on how to load test the battery to make sure that isn't the problem:

https://www.2carpros.com/articles/car-battery-load-test

If you don't have a multi-meter you can get an inexpensive one on Amazon or at Harbor Freight if you have one locally.

If you can check that all these wires are securely connected and all fuses and relays are good I feel you will find the problem. Please keep us up to date on your progress and thank you for using 2CarPros!

Hello once again.

Here is the actual test procedure for that code for your car:

B6/1 (Camshaft Hall sensor)

Check component B6/1 (Camshaft Hall sensor).

Test 1 Check Actual Value B6/1 (Camshaft Hall sensor)
Test 2 Test Voltage Supply of Component B6/1 (Camshaft Hall Sensor)
Test 3 Test Signal Voltage of Component B6/1 (Camshaft Hall Sensor)

1 Check Actual Value B6/1 (Camshaft Hall sensor)

Test requirement
- Carry out measurement with engine running.

Status of relevant actual value:
- B6/1 (Camshaft Hall sensor): Note! Communication with ECM required.

Specified value
- [SIGNAL PRESENT]

Question
- Is the actual value o.K?
Yes
The actual value is okay. ** End of Test **
No
The actual value is not o.K.
Possible cause and remedy
- Test voltage supply of component B6/1 (Camshaft Hall sensor).
- Leads to component B6/1 (Camshaft Hall sensor)
- Component B6/1 (Camshaft Hall sensor)

** End of Test **

2 Test Voltage Supply of Component B6/1 (Camshaft Hall Sensor)

Test requirement
- The actual value is not o.K.

Test sequence
- Switch off ignition.
- Detach the socket at the component B6/1 (Camshaft Hall sensor).
- (B6/1) 1 3 (B6/1)
- Switch on ignition.

Specified value
- Voltage[11.0.14.5] V

Question
- Is the measured value okay?
Yes
The measured value is o.K.
Possible cause and remedy
- Signal wire
- B6/1 (Camshaft Hall sensor)
No
The measured value is not o.K.
Possible cause and remedy
- K40/7f29 (Fuse 29)
- Leads to component B6/1 (Camshaft Hall sensor)

** End of Test **

3 Test Signal Voltage of Component B6/1 (Camshaft Hall Sensor)

Test requirement
- Carry out measurement with engine running.

Test sequence
- Switch off ignition.
- Connection Measuring system
- A4 Blue socket Green socket A7
- Operate engine at idling speed.

Specified value
- Measuring system

Note
- Measuring system:Continue with key F2

Note
- Measuring system HMS990 integrated in STAR DIAGNOSIS, is required for performing the next test step. Switch on measuring system HMS990 for this step. Continue with key F3
- If measuring system HMS990 is not integrated in your STAR DIAGNOSIS, it is also possible to carry out the next tests with alternative measuring equipment such as oscilloscope, pressure gage or digital multi-meter. Continue with key F4

Question
- Is measuring system HMS990 to be started?

Question
- Is the measured value okay?
Yes
The measured value is o.K. ** End of Test **
No
The measured value is not o.K.
Possible cause and remedy
- Signal wire
- B6/1 (Camshaft Hall sensor)

** End of Test **

As you can see there should be voltage on 2 wires, one should be around battery voltage (supply) the other should be around 5 volts (signal). The battery voltage circuit also supplies the fuel injectors and a lot of other components of the system so if you don't have the voltage present it will not run. I would start there and make sure you have voltage, making sure the fuse specified in the test is good.

If you do have the voltage as specified then you will have to do as you stated and back track until you find the issue. In my experience the most common issue in a situation like this is a missed ground so pay close attention to them and make sure they are properly attached and tightened.

As always we will be very interested in your progress so please keep us up to date and thank you for using 2CarPros!