Iat Sensor Removal - Mercury V6 175 Diagnostic Manual

Sensors
4. Perform a continuity check of the sensor wiring between the sensor connector and the PCM. Note that there are splices in
the sensor ground circuit.
NOTE: The quickest way to check the wiring is to measure the resistance of the thermistor at room temperature, connect
the sensor to the engine harness, and measure the resistance across PCM connector sockets CE1 and BL2. If the two
resistance values match, then the wiring is good.
DMT 2004 Digital Multimeter
Terminal Test Probe Kit
M
b
A
4 1
A
c
H
1 4
Connector
A
B
65666

IAT Sensor Removal

1. Remove the starboard air intake runner. Refer to the appropriate service manual.
2. Disconnect the engine harness connector from the IAT sensor.
Page 5A-24
Intake Manifold Air Temperature Sensor Resistance Test
Temperature
0 °C (32 °F)
15 °C (59 °F)
25 °C (77 °F)
100 °C (212 °F)
A1
TAN
L2
100A
M4
A1
E1 BLK/ORN 100B
H4
Pin Wire Color
A Tan
B Black/orange
© 2018 Mercury Marine
91‑892647A01
Bosch P/N MM‑ 46523
TAN
A
BLK/ORN
B
67519
Air temperature signal
Sensor ground A (–)
Reading
6.18–6.83 kΩ
3.04–3.36 kΩ
2.00–2.21 kΩ
0.14–0.16 kΩ
a - Intake air temperature (IAT)
sensor connector
a
b - PCM connector B
c - PCM connector C
Function
90-8M0146617 eng JULY 2018
PCM
BL2
CE1