Pinpoint Test D: Dtc B1259 Or Dtc B1261 - Solar Radiation Sensor - Lincoln 2006 Town Car Workshop Manual

2006 Town Car Workshop Manual
An open in circuit 476 (BN/YE), 468 (BN) or 676 (PK/OG)
A short to ground in circuit 468 (BN) or 476 (BN/YE)
Solar radiation sensor
Electronic automatic temperature control (EATC) module
PINPOINT TEST D: DTC B1259 OR DTC B1261 — SOLAR RADIATION SENSOR OPEN CIRCUIT OR SHORT TO GROUND
D1 CHECK THE SOLAR RADIATION SENSOR RESISTANCE
Ignition OFF.
Disconnect: Solar Radiation Sensor C287.
Measure the resistance between the solar radiation sensor terminals 2 and 6 and
between 1 and 2.
Is continuity present and the resistance greater than 0 ohms?
D2 CHECK THE EATC MODULE OUTPUT VOLTAGE
Ignition ON.
Press the AUTOMATIC button.
Measure the voltage between solar radiation sensor C287-1, circuit 468 (BN) and
C287-2, circuit 676 (PK/OG).
Measure the voltage between solar radiation sensor C287-2, circuit 676 (PK/OG) and
C287-6, circuit 476 (BN/YE).
Are the voltages between 4.7 and 5.1 volts?
D3 CHECK CIRCUIT 468 (BN) AND CIRCUIT 476 (BN/YE) FOR AN OPEN
Ignition OFF.
Disconnect: EATC Module C228b.
Measure the resistance between EATC module C228b-6, circuit 468 (BN) and solar
radiation sensor C287-1, circuit 468 (BN).
Measure the resistance between EATC module C228b-18, circuit 476 (BN/YE) and
solar radiation sensor C287-6, circuit 476 (BN/YE).
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS6G/~MUS~LEN/19/...
Test Step Result / Action to Take
Yes
GO to D2.
No
INSTALL a new solar radiation sensor and bracket. CLEAR the DTCs. REPEAT the
self-test. TEST the system for normal operation.
Yes
GO to D7.
No
If diagnosing DTC 1259, GO to D3 . If diagnosing DTC 1261, GO to
Yes
GO to D4.
No
REPAIR the circuit for an open. CLEAR the DTCs. REPEAT the self-test. TEST the
system for normal operation.
Page 13 of 45
D5 .
12/30/2011