Modulating Piston Displacement Sensor, Checking

-- Press →  button.

Display will appear as shown:

Rapid data transfer HELP  Select function XX

-- Press -0- and -6- buttons to select function 06: "End output".

-- Press Q  button to enter input.

-- Switch OFF ignition.

-- Disconnect 10 pin fuel temperature sensor harness connector (connection to diesel injection pump metering control).

-- Switch Fluke 83 multi-meter to resistance range.

-- Measure resistance between connector terminals: 1 + 2 and 2 + 3.

• Specification: 4.9 to 7.5 Ω

If specification not obtained:

-- Replace diesel injection pump INJECTION PUMP .

-- Display the readiness code READINESS CODE, DISPLAYING .

If DTC memory was erased:

-- Set the readiness code READINESS CODE, SETTING .

If specification obtained:

-- Connect VAG1598/22 (or 1598/31) test box to ECM wiring harness.

-- Check wiring for open circuit between test box and harness connector using Wiring diagram.

Up to MY 1999 

• Terminal 1 + socket 56
• Terminal 2 + socket 57
• Terminal 3 + socket 64

From MY 2000 

• Terminal 1 + socket 108
• Terminal 2 + socket 106
• Terminal 3 + socket 99

• Wire resistance: 1.5 Ω maximum

-- Check wires for shorting to: one another, ground and battery +

• Specification: ∞ Ω

If wiring OK:

-- Replace engine control module -J248- ENGINE CONTROL MODULE .

-- Display the readiness code READINESS CODE, DISPLAYING .

If DTC memory was erased:

-- Set the readiness code READINESS CODE, SETTING .