Condition For Self-Diagnostic System Operation - BOMBARDIER Johnson 90 Service Manual

ENGINE CONTROL SYSTEM
SELF-DIAGNOSTIC SYSTEM
Condition For Self-Diagnostic System Operation
FAILEDITEM
CONDITION
MAP sensor 1 • No signa! (With engine running)
• Receiving an out of range "37 - 860 mmHg (0.20 - 4.53V)" signa! (With
engine running)
CKP sensor • During one crankshaft rotation, 34 signals are not input to the ECM
IAC valve / Bypass air screw • IAC valve operates at 90% duty or higher when CTP switch is "ON" (NOTE 1)
adjustment
CMP sensor • During two crankshaft rotations, 4 signals are not input to the ECM
CTP switch
• Receiving "ON" signa! when engine speed is 2500 rpm or higher and intake
manifold pressure is 319 mmHg or higher
Cylinder temp. sensor
• No signal
• Receiving an out of range "- 46 to
+
170 ºC (0.1 O - 4.63V)" signal
IAT sensor
• No signa!
• Receiving an out of range "- 46 to
+
178 ºC (0.04 - 4.46V)" signal
MAP sensor 2 (Pressure detect • Receiving unchanging signal regardless engine speed change (NOTE 2)
passage)
Rectifier and regulator
• Receiving 16 volts or higher signa!
(Overcharging)
Exhaust manifold temp. sensor • No signa!
• Receiving an out of range "- 46 to
+
170 ºC (0.1 O - 4.63V)" signa!
Fuel injector
• No operation signa! from the ECM
NOTE 1:
These conditions wi/I be caused by /AC va/ve failure or
incor­
rect bypass air screw adjustment. lf IAC va/ve is always
closed or bypass air is too low, the ECM controls the IAC
va/ve duty to increase to maintain the idling / trolling speed
specified.
NOTE 2:
This condition will be caused by c/ogged pressure detect
pes­
sage in intake manifold.
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