Pinpoint Test DN: Pressure and Temperature Sensors: Introduction

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

This pinpoint test is intended to diagnose the following:

turbocharger boost pressure (TCBP)/charge air cooler temperature (CACT) sensor (9F479)
manifold absolute pressure (MAP)/intake air temperature 2 (IAT2) sensor (9F479)
harness circuits: CACT, IAT2, MAP, TCBP, SIGRTN and VREF
powertrain control module (PCM) (12A650)

TCBP/CACT TRANSFER FUNCTION CHART

Volts	Pressure in kPa	Pressure in psi	Pressure in In-Hg
0.3	13.16	1.91	3.89
0.4	20	2.9	5.91
0.986	60	8.7	17.72
2.157	140	20.31	41.34
3.329	220	31.91	64.97
4.5	300	43.51	88.59
4.8	320.49	46.48	94.64

MAP/IAT2 TRANSFER FUNCTION CHART

Volts	Pressure in kPa	Pressure in psi	Pressure in In-Hg
0.3	5.53	0.8	1.63
0.4	10.0	1.5	2.95
1.63	65	9.43	19.19
2.301	95	13.78	28.05
3.643	155	22.48	45.77
4.65	200	29	59.06
4.8	206.71	29.98	61.04

TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS

Temperature		Temperature Sensor Values
°C	°F	Voltage	Resistance (K ohms)
120	248	0.28	1.18
110	230	0.36	1.55
100	212	0.47	2.07
90	194	0.61	2.80
80	176	0.80	3.84
70	158	1.05	5.37
60	140	1.37	7.70
50	122	1.77	10.97
40	104	2.23	16.15
30	86	2.74	24.27
20	68	3.26	37.30
10	50	3.73	58.75
0	32	4.14	95.85
-10	14	4.45	160.31

Fig 1: Turbocharger Boost Pressure/Charge Air Cooler Temperature (TCBP/CACT) Sensor Connector

Courtesy of FORD MOTOR CO.

Fig 2: Manifold Absolute Pressure/Intake Air Temperature 2 (MAP/IAT2) Sensor Connector

Courtesy of FORD MOTOR CO.

For PCM connector views or reference values, refer to REFERENCE VALUES .

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PIN REFERENCE CHART

Connector	Pin	Circuit
190-Pin	E40 E38 E49 E31 E24 E49	MAP TCBP SIGRTN IAT2 CACT SIGRTN