Discovery II
AUTOMATIC GEARBOX - ZF4HP22 - 24
44-20
DESCRIPTION AND OPERATION
P1613
(1)
* Solenoid valves
power supply relay,
sticking open or short
circuit
Limp home mode in low and high ranges. Shift
pressure to maximum, harsh gear shifts/
engagement.
On
On
P1705
(39)
Transmission high/low
range, implausible
input
No apparent effect
On
Off
P1810
(12, 13)
Sport/Manual warning
lamp circuit fault
Lamp fails bulb check or is permanently
illuminated. No effect on gearbox operation.
On
Off
P1841
(16)
* CAN bus fault
Maintains current gear in low range, limp
home mode in high range. Shift pressure to
maximum, harsh gear shifts/engagement.
On
On
P1842
(15)
* CAN level monitoring
Maintains current gear in low range, limp
home mode in range. Shift pressure to
maximum, harsh gear shifts/engagement.
On
On
P1843
(17)
* CAN time-out
monitoring
Maintains current gear in low range, limp
home mode in high range. Shift pressure to
maximum, harsh gear shifts/engagement.
On
On
P1884
(11)
* CAN message:
Engine friction invalid
No apparent effect.
On
Off
P1884
(18)
* CAN message:
Throttle position invalid
Substitute throttle angle of 50% adopted. No
kickdown. Operates in economy modes only.
On
On
P1884
(19)
CAN message: Engine
temperature invalid
Substitute engine temperature derived from
other inputs. No apparent effect.
On
Off
P1884
(20)
CAN message: Road
speed invalid
No apparent effect
On
Off
P1884
(33, 34)
* CAN message:
Engine torque invalid
Substitute engine torque of derived from other
inputs. May affect shift quality.
On
Off
P1884
(35)
* CAN message:
Engine speed invalid
Maintains current gear in low range, limp
home mode in high range. Shift pressure to
maximum, harsh gear shifts/engagement.
On
On
P1884
(37)
CAN message: Engine
air intake temperature
invalid
No apparent effect.
On
Off
P1844
(38)
Altitude shift control
invalid
No reduced torque compensation, possible
reduction in performance/ driveability at
altitude or high ambient temperatures.
On
Off
* = Emissions (OBD II) relevant
†On = MIL illuminates immediately (in all other faults, MIL On = illuminates in the 2nd consecutive drive cycle if
fault still present)
Fault code,
OBD II
(TestBook)
Fault description
Effect
Warning lamp
illumination
MIL
Sport/
Manual