3.1.13-178
CS35 2013.04
3.1.13-178Electronic Control System - ME7
DTC P0321, P0322
1. DTC Description
2. Possible Sources
Fault Code Description Definition
P0321
Crankshaft upper dead point
missing teeth signal unreason-
able
Crankshaft upper dead center signal fault. CKP sen-
sor signal tells ECM the speed and position of cur-
rent crankshaft CKP sensor produces an alternating
voltage with different amplitude and frequency. Fre-
quency is decided by crankshaft speed and output
alternating voltage is decided by CKP. CKP sensor
cooperates with crankshaft's last retaining 58X vari-
able reluctance rotor. ECM can calculate ignition
timing, injection timing and knock ignition control
according to input signal of CKP sensor and cam-
shaft position sensor. CKP sensor is used for
inspection of misfire and tachometer display. ECM
transmits engine speed signal to instrument via CAN
network. CKP sensor signal is connected to termi-
nals 15, 34 of ECM wiring harness connector E01
respectively via terminals 1, 2 of CKP sensor wiring
harness connector E07.
P0322 Speed sensor signal fault
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0321
• Frequent correc-
tion to increase
tooth
• Frequent correc-
tion to decrease
tooth
• Speed sensor sig-
nal exist but the
reference mark
can not be found
• Frequently lost
reference mark
• Increase one tooth correction numera-
tion time is bigger than 250
• Decrease one tooth correction
numeration time is bigger than 250
• Unmonitored reference mis - tooth
numeration time 4 is bigger than 6
• The correction numeration time of the
lost reference mis - tooth is more than
2,000
• Crankshaft position sensor
fault
• Crankshaft position sensor
circuit fault
•ECM fault
P0322
After a certain num-
ber of camshaft
position
sensor signal, no
crankshaft position
signal is monitored
• Phase signal register value is higher
than 18
• Relative low speed engine group
speed
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