XJ-S Convertible (XJ27) L6-4.0L (1996)
-
Neutral/Drive switch falsely shows Neutral.
-
Neutral/Drive wiring I connector short circuit to ground
-
Neutral/Drive wiring pulled low by other ECM
Gear Change Neutral/Drive, P1516
Test checks whether the Neutral/Drive switch is incorrectly indicating neutral, by detecting high engine load conditions or gear changes (on
automatic transmission vehicles). This test monitors for gear change request signals whilst the Neutral/Drive switch indicates neutral.
Possible Causes:
-
Neutral/Drive switch falsely shows N
-
Neutral/Drive wiring/connector short circuit to ground
-
Neutral/Drive wiring pulled low by other ECM
-
Transmission ECM fault - sending extra ignition retard requests
-
Road speed sensor fault - but undetected
-
Road speed signal pulled down by another consumer ECM - but undetected
-
Road speed signal swamped by Radio Frequency Interference (RFI) - but undetected
-
Road speed signal wrongly sent by other ECM - but undetected
Cranking Neutral/Drive, P1517
A test checks for whether the Neutral/Drive switch is incorrectly indicating drive by detecting cranking.
Possible Causes:
-
Neutral/Drive switch falsely shows D
-
Cranking inhibit not working with switch in D
-
Neutral/Drive wiring/connector open circuit
-
Neutral/Drive wiring pulled high by other ECM
-
Neutral/Drive wiring/connector short circuit to voltage source
-
ECM engine speed signal corrupted to look like cranking - Radio Frequency Interference (RFI)