Typical Diagnostic Reference Values
TYPICAL DIAGNOSTIC REFERENCE VALUESNOTES:
The footnotes are referenced throughout the Typical Diagnostic Reference Value Charts. A letter in parentheses next to a value indicates supplemental information is available.
The Typical Diagnostic Reference Value Charts do not display fault parameter identifications (PIDs). These are PIDs which indicate a hard fault with the circuit. They display a value of YES or NO and are PIDs ending with an F.
The Typical Diagnostic Reference Value Charts do not display limited operating strategy (LOS) PIDs. These are PIDs which indicate what LOS mode that vehicle is in. They display a value of YES or NO.
Reference values may vary 20%, depending on operating conditions and other factors. RPM values are axle and tire dependent.
Values are taken at an altitude of approximately 189 meters (620 ft) above sea level with the engine at normal operating temperature and accessories off.
For the downstream heated exhaust gas oxygen (HO2S12) sensor, greater activity results when the catalyst monitor is active.
Refer to the Introduction, Acronyms and Definitions for technical terms applicable to Ford Motor Company products. Application and ID
Refer to Diagnostic Methods, Parameter Identification (PID), for PID descriptions. Parameter Identification (PID)
A. The universal heated exhaust gas oxygen sensor (HO2S), uses a current controller in the PCM to infer an air/fuel ratio relative to the stoichiometric air/fuel ratio. By measuring the current required to pump the oxygen in or out, the air fuel ratio (lambda) can be estimated. The amount of current required to pump the oxygen ions in or out of the measurement chamber is used to measure the air/fuel ratio. Valid HO2S switching only occurs during closed loop fuel control.
B. Cooling Fan ON (single, low or high speed)
C. The downstream HO2S stays close to a constant voltage when the catalyst monitor is off (positive value only). When the catalyst monitor is on, HO2S switches from rich to lean above and below 0.450 DCV and should never be a negative value.
D. Value depends upon ambient air temperature and may fall outside of range.
E. Traction battery power off requested.
F. Transaxle control module (TCM) requesting powertrain malfunction indicator (wrench) on.
G. TCM requesting hazard indicator on.
H. Powertrain control module (PCM) requesting generator motor shutdown.
I. PCM requesting traction motor shutdown.
J. Engine must be running or cranking.
K. Heater on.
L. Gear selector in DRIVE position.
M. Gear selector in PARK position.
2.5L 4V Escape/Mariner Hybrid (Part 1):
2.5L 4V Escape/Mariner Hybrid (Part 2):
2.5L 4V Escape/Mariner Hybrid (Part 3):
2.5L 4V Escape/Mariner Hybrid (Part 4):
2.5L 4V Escape/Mariner Hybrid (Part 5):
