NHTSA ID Number: 10198620
Manufacturer Communication Number: MSP58
TSB/Document Date: 2021-07-01
Summary
MSP58 - DOSING CONTROL UNIT REPROGRAMMING. On the subject CX-5 vehicles, diagnosis for the Selective Catalytic Reduction (SCR) system failure may not function properly, leading to an inappropriate/delayed failure detection of the Dosing Control Unit (DCU), with codes DTC P2048 and DTC P229F. Mazda
Motor Corporation has decided to conduct a Mazda Service Program (MSP) on certain 2019 CX-5 Diesel-fueled vehicles produced from March 23, 2018 through July 31, 2019. DTC P2048:00 - Urea injector circuit low input. Normally the diagnosis of urea injector coil resistance activates while the injector is operating and detects a failure based on the electric current value in the injector coil. On the subject vehicles, the diagnosis activates also while the injector is not operating due to inappropriate software of DCU, which allows the coil resistance to be temporarily judged to be normal, even if any abnormality occurs in the coil resistance value. DTC P229F:00 - NOx sensor No.2 system: NOx concentration malfunction. Normally the diagnosis of NOx sensor output characteristics (gain diagnosis) activates during IG-OFF and detects a failure based on the output value (gain value) of NOx sensor. On the subject vehicles, if a significant fluctuation occurs in the output value, the diagnosis may not be completed within the timing due to inappropriate software of DCU. This can cause delayed detection of sensor failure and lead to a delayed MIL illumination.
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TSB/Document ID: MSP58
Replacement Service Bulletin Number:
MFR Communication Date: 2021-06-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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WI
maZzos
MAZDA DEALER EMAIL
June 29, 2021
Attention: | Mazda General, Parts and Service Managers
Subject: Mazda Service Program (MSP) 58-2019 CX-5 Diesel DCU Module Reprogramming.
Dealer Mazda Dealer Partners,
Mazda Motor Corporation has decided to conduct a Mazda Service Program (MSP) on certain 2019 CX-5
Diesel-fueled vehicles produced from March 23, 2018 through July 31, 2019.
Subject Vehicles:
Affects 561 US CX-5 Diesel -fueled vehicles only
Model Subject VIN range Subject production date range
2019 CX-5 JM3 KF**** KO 568893 —- 678929 From March 23, 2018 through July 31, 2019
Concern Outline:
On the subject CX-5 vehicles, diagnosis for the Selective Catalytic Reduction (SCR) system failure may not
function properly, leading to an inappropriate /delayed failure detection of the Dosing Control Unit (DCU),
with codes (1) DTC P2048 and (2) DTC P229F.
® DTC P2048:00 - Urea injector circuit low input
Normally the diagnosis of urea injector coil resistance activates while the injector is operating and detects a
failure based on the electric current value in the injector coil. On the subject vehicles, the diagnosis activates
also while the injector is not operating due to inappropriate software of DCU, which allows the coil resistance
to be temporarily judged to be normal, even if any abnormality occurs in the coil resistance value.
@ DTC P229F:00 - NOx sensor No.2 system: NOx concentration malfunction
Normally the diagnosis of NOx sensor output characteristics (gain diagnosis) activates during IG-OFF and
detects a failure based on the output value (gain value) of NOx sensor. On the subject vehicles, if a significant
fluctuation occurs in the output value, the diagnosis may not be completed within the timing due to
inappropriate software of DCU. This can cause delayed detection of sensor failure and lead to a delayed MIL
illumination.
For all subject vehicles:
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