Honda SH300 2006 Manual page 144

FUEL SYSTEM (PGM-FI)
5. ECT Sensor Output Line Short Circuit Inspection
Disconnect the test harness and ECM 33P con-
nector disconnected.
Check for continuity between the ECT sensor
connector of the wire harness side and ground.
Connection: Pink/white – Ground
Is there continuity?
YES
NO
MIL 8 BLINKS (TP SENSOR)
• Before starting the inspection, check for loose or
poor contact on the sensor unit 5P (Black) con-
nector and recheck the MIL blinking.
1. TP Sensor System Inspection
Turn the ignition switch OFF.
Connect the ECM test harness to ECM connector
(page 6-14).
Turn the ignition switch ON and engine stop
switch "
Measure the TP sensor output voltage at the test
harness terminals.
Connection: A5 (+) – A4 (–)
Standard:
• A voltage marked * refers to the value of the
ECM output voltage (Step 2) when the volt-
age reading shows 5 V.
When the ECM output voltage reading shows
other than 5 V, derive the TP sensor output
voltage at the test harness as follows:
In the case of the ECM output voltage is 4.75
V:
0.4 X 4.75/5.0 = 0.38 V
0.6 X 4.75/5.0 = 0.57 V
Thus, the solution is "0.38 – 0.57 V" with the
throttle fully closed.
Replace 0.4 and 0.6 with 4.2 and 4.8 respec-
tively, in the above equations to determine
the throttle fully opened range.
Is there standard voltage?
YES
NO
6-34
– Short circuit in Pink/white wire
– Replace the ECM with a known good
one, and recheck; refer to Key Registra-
tion Procedures (page 23-4)
".
*0.4 – 0.6 V (throttle fully closed)
*4.2 – 4.8 V (throttle fully opened)
– • Intermittent failure
• Loose or poor contact on the ECM
connector
– GO TO STEP 2.
3P (Gray) CONNECTOR
(Wire side of female terminal)
P/W
TEST HARNESS PIN BOX
G/O
W/R