83.1 SPN 1073/FMI 4
This fault code indicates that the Jake Brake Stage 2 circuit failed low.
83.1.1
Short to Ground Check
Check as follows:
1. Disconnect the front injector valve cover harness.
2. Measure resistance between pin 12 and ground on the front injector valve cover harness
connector. If you are using J-48671–10, measure across the rear Jake pins.
[a] If the resistance is greater than 15 Ω, repair short to ground between pin 12 of
the front injector valve cover harness connector and pin 32 of the 120–pin MCM
connector. Refer to section 83.1.1.1.
[b] If the less is greater than 5 Ω, go to step 3.
3. Remove the upper valve cover.
4. Disconnect the Front Jake Brake Harness
5. Measure resistance between either terminal on the Jake Brake solenoid and ground.
[a] If the resistance is less than 5 ohms, replace the Jake Brake solenoid. Refer to section
83.1.1.1.
[b] If the resistance is greater than 5 Ω, repair the short to ground between pins 11 and 12
of the front injector valve cover harness. Refer to section 83.1.1.1.
83.2 SPN 1073/FMI 5
This fault code indicates that the Jake Brake Stage 2 circuit failed open.
83.2.1
Open Circuit Check
Check as follows:
1. Check for multiple codes.
[a] If SPN 1073/5 and SPN 2791/5 are active repair the open between the pin 62 of the
120–pin MCM connector and the front Jake Brake and fan control solenoids.
[b] If only SPN 1073/5 is active, go to step 2.
2. Disconnect the front injector valve cover harness.
3. Measure the resistance between pins 11 and 12 on the front injector valve cover harness
connector. If you are using J-48671–10, measure across the front Jake pins.
[a] If the resistance is greater than 150 Ω, go to step 4.
[b] If the resistance is less than 15 Ω, repair the open between pin 12 of the front injector valve cover harness connector and pin 32 of the 120–pin MCM connector.
Refer to section 83.2.1.1.
4. Remove the upper valve cover.
5. Measure the resistance across the front Jake Brake solenoid.
[a] If the resistance is greater than 15 Ω, replace the Jake Brake solenoid. Refer to section
83.2.1.1.
[b] If the resistance is less than 15 Ω, repair the open between pins 11 and 12 of the front
injector valve cover harness connector and the Jake Brake solenoid. Refer to section
83.2.1.1.
