TROUBLESHOOTING

Starting or driveability issues? Send your scanner data.

Fill in Ken’s diagnostic form with the fault codes and live data from your scanner, and it’s emailed to the shop.

Ken’s diagnostic form

Your truck and contact details

Full name

Email address

Phone number

Engine year and RPO code

Serial / invoice number on ECM connector Optional

Scan for fault codes

If codes are present, list them below in order with the number and description. Listing in order is important as they are prioritized in the ECM from most to least important.

No fault codes present

Top OBD “P” fault codes, most important first

Fault code 1Description for fault code 1

Fault code 2Description for fault code 2

Fault code 3Description for fault code 3

Go to the scanner Live Data screen

All values are read through the OBD port with a scanner only. No volt meter tests or guessing.

Enter the actual values

Enter the actual values from scanner Live Data next to the sensors listed below, even if a zero is shown. Leave a field blank only if your scanner can’t show it.

Voltage (key on)
Voltage (while cranking)
May need to use a mechanic’s start switch on the starter solenoid.
APP (accelerator pedal position) at idle
Can be a percentage or a voltage.
Does the APP change with pedal movement?
MAP (manifold absolute pressure)
Key on, engine not running.
MAF (mass air flow)
Crank the engine to see if it’s responding.
IAT (intake air temp at MAF)
IAT #2 (Y-bridge)
ECT (coolant temp)
EOP (engine oil pressure)
Or does it change when cranking?
Fuel line pressure (from the tank to the CP3/4)
Must be read on a gauge and must not drop when cranking.
Fuel rail pressure (desired)
Must be read on the scanner.
Fuel rail pressure (actual)
Must be read on the scanner.
Fuel rail pressure (while cranking)
Must be read on the scanner.
FRT (fuel rail temp)
RPM
Should be 150 during cranking.
CAM signal
Advanced scanner required.
MPH or KPH while idling in Park or Neutral

Your report goes to the shop at [email protected], and a copy is emailed to you.

Prefer email? Send your fault codes and readings to [email protected] with your engine year and RPO code.